Industry Terms

Industry Terms & Commonly Used Slang

Scratching your head over what “kief” is? 

Since many of our learners are newbies in the cannabis industry, you might see confusing words or phrases in the community. Browse our glossary to find a variety of cannabis term definitions and become more educated on industry terminology. 

This glossary will clear up the confusion and get you speaking like a native GC'er in no time! Also, please add new glossary terms if you see anything missing.

Browse the glossary using this index

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Any of the non-metallic elements fluorine, chlorine, bromine, iodine, and astatine existing in a free state - halogens are enclosed within the arc tube of a Metal Halide (MH) lamp.


Gradual adaptation of indoor or greenhouse plants to an outside environment.


Hash or hashish is the resin collected from the flowers of the cannabis plant and a colloquial term. The active ingredient in the hash is Tetrahydrocannabinol (or THC) and hash can be smoked in joints or out of bongs or pipes. The effects of a high caused by smoking hash include sleepiness, pain relief, a feeling of relaxation, and increased appreciation of music and food. Most of the THC from hash is absorbed and catalyzed within the first few seconds of entry into the body, so holding smoke into the lungs for a longer amount of time will not hasten the achieved high.

Hash Oil

Hash oil or cannabis oil is obtained by the extraction of cannabis or hashish. It is a concentrated form of the plant containing many of its resins and terpenes - in particular, Tetrahydrocannabinol (or THC), Cannabidiol (or CBD), and other cannabinoids. There are a variety of extraction methods, but most involve a solvent such as butane or ethanol. Hash oil is usually consumed by smoking, vaporizing or eating but sometimes other methods are employed. Hash oil is sometimes sold in cartridges to be used with pen vaporizers.


A very popular Sativa strain, often stimulating creative behavior and energizing head highs. It’s thought to originate in various tropical regions of the world, specifically in Mexico, Colombia, and parts of South East Asia. Haze plants are some of the tallest growing varieties of cannabis, often reaching 20 feet (or six meters) tall. Because of its size, it often takes longer to harvest, which makes it one of the more difficult plants to grow. Haze is commonly crossbred with Indica strains to create award-winning strains like Northern Lights. Other popular strains of haze include Super Lemon Haze and XXX.

Head Shop

A retail outlet specializing in paraphernalia used for consumption of cannabis and tobacco and items related to cannabis culture and related countercultures. Products may include magazines (ex. about cannabis culture, cannabis cultivation, tattooing, and music), clothing, and home décor (ex. posters and wall hangings illustrating drug culture themes such as cannabis, jam bands like The Grateful Dead, psychedelic art, etc.). 

Heady Glass

It is a type of an artistic, high-quality glass pipe with unique design and specifications. It offers brilliant color schemes, visual effects and is made in such limited quantities making it extremely valuable. A heady glass gives its users advanced glassblowing techniques like reversals, wig wags, sandblasting, fuming, rettis, honey comb and worked sections etc. making it a one of a kind device.

Heat Cleaning

The process of excessively torching a nail or banger to remove any reclaim or burnt-on residual concentrate.


Refers to a local variety of cannabis that was taken from its native land and propagated in another geographic location while maintaining its original genetics. This means that the strain is pure, having never been crossed and always grown in its natural environment. The landrace strains are commonly named after their native regions (ex. Afghani, Thai, Colombian, Hawaiian, etc.) and the traces of these native strains are sometimes detectable in the names of its crossbred progeny.


Cannabis that is typically cultivated for its industrial uses such as oils and topical ointments, as well as fiber for clothing, paper, rope, building materials, and more applications which don’t involve intoxication. As hemp is naturally a high-growing plant, it is usually grown outdoors to maximize its size and yield. The focus is not on producing buds but on building the length of the stalk for fiber production. It has very low levels of Tetrahydrocannabinol (or THC), typically less than 0.3%, but much higher Cannabidiol (or CBD) concentrations.

Hemp Hurds

Hemp hurds, also known as shives or hemp wood, are an agricultural product made from hemp. Hurds consist of the woody inner portion of the hemp stalk, broken into pieces and separated from the fiber in the processes of breaking and scutching and correspond to the shives in flax, but are coarser and usually softer in texture. Hurds have traditionally been a by-product of fiber production.

Hemp Oil

Hemp oil or hempseed oil is obtained by pressing hemp seeds. Cold pressed, unrefined hemp oil is dark to clear light green in color, with a nutty flavor. The darker the color, the grassier the flavor. It should not be confused with hash oil, a tetrahydrocannabinol-containing oil made from the Cannabis flower, hailed by some for its medicinal qualities.


Hempcrete or Hemplime is bio-composite material, a mixture of hemp hurds (shives) and lime (possibly including natural hydraulic lime, sand, pozzolans) used as a material for construction and insulation. It is marketed under names like Hempcrete, Canobiote, Canosmose, and Isochanvre. Hempcrete is easier to work with than traditional lime mixes and acts as an insulator and moisture regulator. It lacks the brittleness of concrete and consequently does not need expansion joints. The result is a lightweight insulating material ideal for most climates as it combines insulation and thermal mass.


Slang term for cannabis and refers to the many similarities between cannabis and other popular cooking herbs and spices. It helps the comparison that cannabis happens to be a green, leafy substance that just so happens to be delicious when added to pasta, pizza, or any dinner dish that could benefit from liberal spicing.


Having flowers of both sexes on the same cannabis plant - are more correctly referred to as 'intersex.'

Hertz (or Hz)

A unit of frequency that cycle one time each second - a home with a 60-hertz Alternating Current (or AC) current cycles 60 times per second.


Hybrid vigor such that an F1 hybrid falls outside the performance range of cannabis parents with respects to some character or characters - usually applied to size, the rate of growth or general vigor.

Heterozygous Loci

Regions along homologous chromosomes that have different alleles.

High-Cannabinoid Full Spectrum Extract (or HCFSE)

Created through hydrocarbon extraction with an emphasis on cannabinoid preservation.

High-Intensity Discharge (or HID) Lamp

Type of lamp used in many indoor grow rooms, High-Intensity Discharge (or HID) lamps are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube. Various types of chemistry are used in the arc tubes of HID lamps, depending on the desired characteristics of light intensity, correlated color temperature, Color Rendering Index (or CRI), energy efficiency, and lifespan.

High-Terpene Full Spectrum Extract (or HTFSE)

Created through hydrocarbon extraction with an emphasis on terpene preservation.

Homologous Chromosomes

Members of paired chromosomes in non-gametic cells and homologous chromosomes are similar in size, shape, and function - one of each chromosomal pair is derived from the male plant, the other from the female.


A sticky honey-like substance secreted onto foliage by aphids, scale, and mealy bugs.


The reflective cover of a High-Intensity Discharge (or HID) lamp.


The abbreviation stamped on some High-Intensity Discharge (HID) bulbs meaning they may be used in a horizontal position.


A chemical substance that controls the growth and development of a cannabis plant - root-inducing hormones help the clones root.


The science and art of cultivating cannabis plants.

Hose Bib

Water outlet usually found outdoors that contains an on/off valve.

Hostile Environment

An environment that is unfriendly and inhospitable to pests and diseases, and/or cannabis plants.

Hot Box

To hot box a location, you must smoke so much cannabis inside that the air is literally filled with smoke. A proper hot box works best inside of small spaces, such as a closet or bathroom.


Dark, fertile, partially decomposed plant or animal matter - humus forms the organic portion of the soil.


An offspring from two plants of different breeds, variety, or genetic make-up. Hybrid strains of cannabis refer to those in between the two ends of the genetics spectrum - the subspecies Cannabis Indica and Cannabis Sativa. 

Hybrid Vigor

Greater strength and health or faster rate of growth in the offspring resulting from the cross-breeding of two gene pools.


Short for hydroponic, this system is a plant-growing technique that does not require soil. All the plant's nutrients are delivered through nutrients in the water, as opposed to the conventional method of topsoil. The traditional topsoil-farming methods require lots of land and space, but a hydroponic system is much more efficient in terms of plant-to-space ratio. The term hydro can also be another synonym for cannabis, but only when the cannabis has been grown in a hydroponic system.

Hydrocarbon Extraction

This refers to an extraction process that utilizes hydrocarbon solvents such as butane, propane and hexane to separate the trichomes from the plant material. It is used to make a variety of cannabis concentrates. The process should be carried out in controlled environments as hydrocarbon solvents are volatile solvents and heavier than air hence tend to pool on the floor of a space that isn’t properly ventilated, resulting in dangerous explosions when ignited.


Light, colorless, odorless, highly flammable gas - hydrogen combines with oxygen to form water.


Hydroponics refers to a growing medium that utilizes a soilless system to cultivate cannabis plants. The method involves placing the growing seedlings in a solution of water and nutrients enabling the grower to control the environment that the plants are grown in. With hydroponics, variables like pH, nutrient levels and temperature are easily controlled unlike a soil ecosystem that can be difficult to control plant’s environment.


Instrument for measuring relative humidity in the atmosphere.

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