[sahy-kloh-oh-luh-fin, sik-loh-]
noun Chemistry.
  1. any of the homologous series of unsaturated, alicyclic hydrocarbons, as cyclooctatetraene and cyclopentadiene, containing one double bond in the ring and having the general formula C11H2n−2.

Origin of cycloolefin

First recorded in 1920–25; cyclo- + olefin Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018