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ab·scis·ic acid | \ ˌab-ˈsi-zik- 
, -sik- \
, -sik- \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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Time Traveler for abscisic acid
The first known use of abscisic acid was in 1968
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