quindecone

from The Collaborative International Dictionary of English v.0.48

Quindecone \Quin*dec"one\, n. [L. quindecim fifteen.] (Chem.)
   An unsaturated hydrocarbon, {C15H26}, of the valylene series,
   produced artificially as an oily liquid. [Written also
   {quindekone}.]
   [1913 Webster]