Definition of abscisic acid in English:

abscisic acid

noun

Biochemistry
  • [mass noun] A plant hormone which promotes leaf detachment, induces seed and bud dormancy, and inhibits germination.

    • ‘The hormone abscisic acid induces a myriad of cellular responses in plants via complex signal transduction cascades, leading to tolerance towards various stresses, including cold, drought and salinity.’
    • ‘Of particular interest here is the amphipathic plant hormone abscisic acid.’
    • ‘Analysis of mutant plants suggests that the plant hormones abscisic acid, ethylene and jasmonates are implicated in the long-distance signalling pathway and that the action may be mediated by reactive oxygen species.’
    • ‘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.

Pronunciation:

abscisic acid

/abˈsɪsɪk/