| ABA |
| Abscisic acid - plant hormone, a major factor is mediating the adaptation of the plant to stress. |
| Abaxial |
| The abaxial surface of a leaf is the underside or side facing away from the stem. |
| Accessory Cannabinoids |
| Cannabinoids (CBC, CBD, CBN) which probably interact with the primary cannabinoids (THC) to alter their effect. |
| Accessory Pigment |
| Pigment other then the primary pigment (clorophll) which collects solar energy. |
| Acclimatize |
| Become adapted to new enviromental conditions. |
| Adaxial |
| Oriented toward the shoot meristem, the upper surface of the leaf. |
| Adnate |
| United to a part or organ of a different kind, as stamens attached to petals. |
| Adventitious Roots |
| A root that arises from a stem, rather than from the primary root. |
| Alternate Phyllotaxy |
| Leaves appear singly in a loose staggered spiral along the stem, non opposite. |
| Aneuploid |
| An organism with an unbalanced set of chromosomes (i.e., 2n-1 or 2n+1). |
| Anthesis |
| The period during which a flower is fully open and functional. |
| Anthocyanin Pigment |
| Accessory pigment. Anthocyanin pigments are responsible for the red, purple, and blue colors of many fruits, vegetables, cereal grains, and flowers. |
| Anticlinal |
| Cell divisions that take place in a plane that is perpendicular to the surface of the next surface of the organ. |
| Apical |
| Tip or top position, for example the apex of the stem has an actively growing apical bud. |
| Asexual Propagation |
| Vegetative reproduction by cloning, producing offspring with the genotype identical to that of the single parent. |
| Auxins |
| A class of plant hormones. |
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