The Collaborative International Dictionary
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.
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