Definition of ostiole
: a small bodily aperture, orifice, or pore
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Recent Examples of ostiole from the Web
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As its spores ripen, the puffball’s outer skin, or cuticle, develops one or two small holes called ostioles through which millions of dry spores escape at the smallest disturbance.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ostiole.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of ostiole
New Latin ostiolum, from Latin, diminutive of ostium
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