/ Dictionary / Index A apocynaceous: Meaning and Definition of Find definitions for: a•poc•y•na•ceous Pronunciation: (u-pos"u-nā'shus), [key] — adj. belonging to the Apocynaceae, the dogbane family of plants. Cf. dogbane family. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: apocynaceous (Thesaurus) apocryphal apodal Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language