ostiole noun. ['ɒstɪǝʊl] M19.
[Latin ostiolum dim. of OSTIUM: see -OLE¹.]
Botany. A small orifice or opening; spec. a small pore in the conceptacles of certain algae and the perithecia of certain fungi, through which the spores are discharged.

[TahlilGaran] English Dictionary ▲