/ Dictionary / Index P pterion: Meaning and Definition of Find definitions for: pte•ri•on Pronunciation: (tēr'ē-on", ter'-), [key] — n. Craniom. the craniometric point at the side of the sphenoidal fontanelle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pterion (Thesaurus) pteridosperm ptero- 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