aeroponics n - a technique for growing plants without soil or hydroponic media where the plants are held above a system that constantly mists the roots with nutrient solution
acclimate v - to habituate to a climate not native
acidic adj - relating to or containing an acid; having a pH of less than 7
air conditioner n - an apparatus for controlling, especially lowering, the temperature and humidity of an enclosed space
alkaline adj - relating to or containing an alkali; having a pH greater than 7
annual n - a plant that completes its entire life cycle within the space of a year
aphid n - Any of various small, soft-bodied insects of the family Aphididae, with mouthparts specially adapted for piercing and feed by sucking sap from plants, that excrete a honeydew and live on the undersides of foliage; about the size of a pin head, they may be green, yellow, black, or pink and with or without wings
atmospheric controller n - a device that coordinates CO2 enrichment cycles with ventilation cycles by monitoring temperature and humidity, activating ventilation at user determined preset points and deactivating CO2 enrichment
auxin n - a plant hormone that promotes root formation and bud growth | 
