alkenone

/AE1 L K AH0 N OW1 N IY0/
noun
  1. 1

    (biochemistry) Any long-chain di-, tri- and tetra- unsaturated methyl and ethyl ketones that are synthesized by a limited number of haptophyte microalgae; the degree of unsaturation is a function of the water temperature

  2. 2

    (organic chemistry) Any unsaturated aliphatic ketone