Biology. a small opening or pore, especially in the fruiting body of a fungus.

Origin of ostiole

1825–35; < Latin ōstiolum little door, equivalent to ōsti(um) door (see ostium) + -olum -ole1
Related formsos·ti·o·lar [os-tee-uh-ler, o-stahy-] /ˈɒs ti ə lər, ɒˈstaɪ-/, adjective
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British Dictionary definitions for ostiole


noun biology

the pore in the reproductive bodies of certain algae and fungi through which spores pass
any small pore
Derived Formsostiolar (ˈɒstɪələ) or ostiolate, adjective

Word Origin for ostiole

C19: from Latin ostiolum, diminutive of ostium door
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012