abscisic acid

(ab sisik, -siz-)

an organic acid, CHO, which acts as a growth regulator causing dormancy and abscission of leaves and fruit
sometimes called abscisin

See abscisic acid in American Heritage Dictionary 4

noun Abbr. ABA
A plant hormone, C15H20O4, involved in the abscission of leaves, flowers, and fruits and the dormancy of buds and seeds.

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