/ Dictionary / Index O ostiole: Meaning and Definition of Find definitions for: os•ti•ole Pronunciation: (os'tē-ōl"), [key] — n. a small opening or pore, esp. in the fruiting body of a fungus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ostiole (Thesaurus) ostinato ostium 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