English
exostome
From exo- + -stome.
Formed from exo- + -stome
Proto-Indo-European *h₁eǵʰs ‘out of’
Proto-Hellenic *eks
Ancient Greek ἐκ ‘Out of, from’
Ancient Greek ἔξω ‘outer’
English exo-
Today it means
noun The small aperture or foramen in the outer coat of the ovule of a plant.
Language periods are conventional ranges, not dates for this word.
Etymograph / exostome