/ Dictionary / Index E ethanal: Meaning and Definition of Find definitions for: eth•a•nal Pronunciation: (eth'u-nal", -nl), [key] — n. Chem. acetaldehyde. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ethanal (Thesaurus) Ethan ethane Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language