• synonyms


  1. Biology. a small opening or pore, especially in the fruiting body of a fungus.
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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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ostiole

Historical Examples

  • Ostiole: in Heteroptera, the openings at the sides of meso- and meta- thorax, through which an odoriferous fluid is excreted.

    Explanation of Terms Used in Entomology

    John. B. Smith

British Dictionary definitions for ostiole


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

Word Origin

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