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.
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Origin and Etymology of ostiole
New Latin ostiolum, from Latin, diminutive of ostium
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