gib·ber·el·lic acid | \ ˌji-bə-ˈre-lik- 
\
\Definition of gibberellic acid
: a crystalline acid C19H22O6 that is a gibberellin used especially in the malting of barley
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Time Traveler for gibberellic acid
The first known use of gibberellic acid was in 1954
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