decatyl--prophetes.ai

decatyl Chem.
  (ˈdɛkətɪl)
  [f. Gr. δέκατ-ος tenth + -yl.]
  A synonym of decyl, the univalent hydrocarbon radical C₁₀H₂₁.

1869 Roscoe Elem. Chem. 333 We..consider this body as decatyl hydride, and as not belonging to the amyl group.

Oxford English Dictionary