/ Dictionary / Index A actinomorphic: Meaning and Definition of Find definitions for: ac•tin•o•mor•phic Pronunciation: (ak-tin"ō-môr'fik, ak"tu-nō-), [key] — adj. having radial symmetry. (of certain flowers, as the buttercup) divisible vertically into similar halves by each of a number of planes passing through the axis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: actinomorphic (Thesaurus) actinometer actinomyces 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