/ Dictionary / Index M malacopterygian: Meaning and Definition of Find definitions for: mal•a•cop•te•ryg•i•an Pronunciation: (mal"u-kop"tu-rij'ē-un), [key] — adj. belonging or pertaining to the Malacopterygii (Malacopteri), a group of soft-finned, teleost fishes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: malacopterygian (Thesaurus) malacology malacostracan Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language