/ Dictionary / Index A aliphatic: Meaning and Definition of Find definitions for: al•i•phat•ic Pronunciation: (al"u-fat'ik), [key] — adj. Chem. pertaining to nonaromatic hydrocarbon compounds in which the constituent carbon atoms can be straight-chain, branched chain, or cyclic, as in alicyclic compounds; saturated, as in the paraffins; or unsaturated, as in the olefins and alkynes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: aliphatic (Thesaurus) aliped alipterion Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language