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

Definition of abscisic acid in English:


[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.


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

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