calcium (Ca) n - a secondary plant nutrient that functions as a coenzyme in the synthesis of fatty compounds and cell membranes and is instrumental in adjusting the soils chemistry or pH
calyx n - the sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing a developing bud; usually green
cannabinoids n - any of several compounds with 21 carbon atoms, including THC, cannabinol, and cannabidiol, produced by the cannabis plant and stored in its resin glands
cannabis n - hemp; annual dioecious plant having alternate, palmately divided leaves and tough bast fibers; any of several mildly euphoriant, intoxicating hallucinogenic drugs, such as ganja, hashish, or marijuana, prepared from various parts of this plant; genus belonging to the family Moraceae
carbohydrate n - any of a group of organic compounds, including sugars, starches, celluloses, and gums, that are produced by photosynthetic plants and contain only carbon, hydrogen, and oxygen, usually in the ratio 1:2:1
carbon dioxide (CO2) n - a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis
cellulose n - a complex carbohydrate, (C6H10O5)n, composed of glucose units, that forms the main constituent of the cell wall in most plants
circulation n - the movement or flow of air within a grow room
cfm - acronym for cubic feet per minute; measurement of the speed at which a device can move air
chlorosis n - the yellowing or whitening of normally green plant tissue because of a decreased amount of chlorophyll, often as a result of disease or nutrient deficiency
clone n - An organism descended asexually from a single ancestor
cola n - term used to refer to the dense mass of flowers produced at the tops of the branches of a cannabis plant
compost n - a mixture of decaying vegetation and manure; used as a fertilizer v : convert to compost, as of organic debris
cultivate v - foster the growth of
cutting n - a small branch removed from a plant to propagate a new plant through rooting or grafting | 
