/ Dictionary / Index A agenesis: Meaning and Definition of Find definitions for: a•gen•e•sis Pronunciation: (ā-jen'u-sis), [key] — n. Pathol. absence of or failed development of a body part. sterility; impotence; barrenness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: agenesis (Thesaurus) agendum agenize 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