1 allene | Definition of allene
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allene

noun
al·​lene | \ ˈaËŒlÄ“n\
plural -s

Definition of allene

1 : a gaseous hydrocarbon CH2=C=CH2

— called also propadiene, sym-allylene

2 : a diolefin with its two double bonds in adjacent positions

First Known Use of allene

1875, in the meaning defined at sense 1

History and Etymology for allene

International Scientific Vocabulary, contraction of allylene

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