abscisic acid

(ab sis′ik, -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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