Medical Marijuana Glossary


Medical Marijuana Glossary

Browse the glossary using this index

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H

Halide

binary chemical compound of a halogen(s) with an electropositive element(s)

Halogen

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 lamp

Hardening-Off

gradual adaptation of indoor or greenhouse plants to an outside environment

Hash Oil

solution of tetrahydrocannabinol with high THC content; made from cannabis

Hashish/Hash

a psychoactive drug formed of compressed resin heads of glandular trichomes shaken, washed, or rubbed from cannabis foliage

Hemp

fibrous cannabis low in THC, used to make menagerie of products from textiles to automobiles

Hermaphrodite

an individual having flowers of both sexes on the same plant - are more correctly referred to as 'intersex'

Hertz (Hz)

a unit of frequency that cycle one time each second: A home with a 60 hertz AC current cycles 60 times per second

Heterosis

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

Heterozygous Loci

regions along homologous chromosomes that have different alleles

High Intensity Discharge (HID)

this is the type of lamp used in many indoor grow rooms

Homologous Chromosomes

members of paired chromosomes in non-gametic cells; 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

Honeydew

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

Hood

the reflective cover of a lamp

HOR

the abbreviation stamped on some HID bulbs meaning they may be burned in a horizontal position

Hormone

chemical substance that controls the growth and development of a plant: Root-inducing hormones help clones root

Horticulture

the science and art of cultivating plants

Hose Bib

water outlet usually found outdoors that contains an on/off valve

Hostile Environment

environment that is unfriendly and inhospitable to pests and diseases

Humus

dark, fertile, partially decomposed plant or animal matter: Humus forms the organic portion of the soil

Hybrid

an offspring from two plants of different breeds, variety, or genetic make-up

Hybrid Vigor

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

Hydrogen

light, colorless, odorless, highly flammable gas: Hydrogen combines with oxygen to form water

Hydroponics

growing plants in nutrient solutions without soil, usually in an inert soilless mix

Hygrometer

instrument for measuring relative humidity in the atmosphere