/ Dictionary / Index H hypoplasia: Meaning and Definition of Find definitions for: hy•po•pla•sia Pronunciation: (hī"pu-plā'zhu, -zhē-u, -zē-u), [key] — n. abnormal deficiency of cells or structural elements. (in plants) inability to mature properly owing to a disease or inadequate supply of nutrients. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hypoplasia (Thesaurus) hypopituitarism hypoploid Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language