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The Collaborative International Dictionary

Decyl

Decyl \De"cyl\, n. [L. decem ten + -yl.] (Chem.) A hydrocarbon radical, C10H21., never existing alone, but regarded as the characteristic constituent of a number of compounds of the paraffin series.

Wiktionary

decyl

n. (context organic chemistry English) Either of very many isomeric univalent hydrocarbon radicals, C10H21, formally derived from decane by the loss of a hydrogen atom