Definition of ostiole in English:

ostiole

noun

Botany
  • (in some small algae and fungi) a small pore through which spores are discharged.

    • ‘In other words, the ascocarp is closed but for an ostiole at the distal end.’
    opening, orifice, aperture, hole, outlet, inlet, vent
    View synonyms

Origin

Mid 19th century: from Latin ostiolum, diminutive of ostium opening.

Pronunciation:

ostiole

/ˈästēˌōl/