Definition of abscisic acid
: a plant hormone C15H20O4 that is a sesquiterpene widespread in nature and that typically promotes leaf abscission and dormancy and has an inhibitory effect on cell elongation
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Origin and Etymology of abscisic acid
abscision (variant of abscission) + 1-ic
First Known Use: 1968
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Britannica.com: Encyclopedia article about abscisic acid
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