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abscisic acid Line breaks: ab|scis¦ic acid
Pronunciation: /abˈsɪsɪk/

Definition of abscisic acid in English:

noun

[mass noun] Biochemistry
A plant hormone which promotes leaf detachment, induces seed and bud dormancy, and inhibits germination.
Example sentences
  • Of particular interest here is the amphipathic plant hormone abscisic acid.
  • Subsequently, a signal transduction cascade involving at least four plant hormones, ethylene, auxin, abscisic acid, and gibberellic acid, is activated.
  • When conditions are otherwise in favour of producing the submerged type morphology, an exogenous supply of the plant hormone abscisic acid at an optimal concentration induces aerial type characteristics.

Origin

1960s: abscisic from abscisin (the earlier name for the hormone), from abscission.

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