iso·pro·pe·nyl
| \ -ōpənᵊl, -ˌnil \
Definition of isopropenyl
: the univalent radical CH2=C(CH3)− isomeric with propenyl
isopropenyl -isopropylidene isomerism … is typical of many terpenoids— W. S. Ropp
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Merriam-Webster unabridged
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