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.