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The Collaborative International Dictionary
Exostome

Exostome \Ex"o*stome\, n. [Exo- + Gr. ? mouth :cf. F. exostome.] (Bot.) The small aperture or foremen in the outer coat of the ovule of a plant. [1913 Webster] ||

Wiktionary
exostome

n. (context botany English) The small aperture or foramen in the outer coat of the ovule of a plant.