What is "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.

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