/ Dictionary / Index A acephalous: Meaning and Definition of Find definitions for: a•ceph•a•lous Pronunciation: (ā-sef'u-lus), [key] — adj. headless; lacking a distinct head. without a leader or ruler. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acephalous (Thesaurus) -aceous acephate Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language