WordReference Random House Unabridged Dictionary of American English © 2026
os•ti•ole
(os′tē ōl′),USA pronunciation n.
os•ti•o•lar
(os′tē ə lər, o stī′-),USA pronunciation adj.
- Anatomy, Microbiology, Biology[Biol.]a small opening or pore, esp. in the fruiting body of a fungus.
- Latin ōstiolum little door, equivalent. to ōsti(um) door (see ostium) + -olum -ole1
- 1825–35;