/ Dictionary / Index U undecylenic acid: Meaning and Definition of Find definitions for: un'dec•y•len'ic ac'id Pronunciation: (un'des-u-len'ik, un"-), [key] — Chem. Chem. a light-colored liquid with a fruity odor, CHO, soluble in alcohol and ether: used in perfumes, flavors, plastics, and medicine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. undecillion undefined Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language