/ Dictionary / Index P pteridosperm: Meaning and Definition of Find definitions for: pte•rid•o•sperm Pronunciation: (tu-rid'u-spûrm", ter'i-dō-), [key] — n. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pteridosperm (Thesaurus) pteridophyte pterion Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language