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endostome
noun
en·do·stome
\ˈendəˌstōm\
Definition of endostome
-s
1a : the opening in the inner integument of an ovule having two integuments b : the inner part of the peristome of a moss
2 [New Latin endostoma] : endostoma
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Origin and Etymology of endostome
International Scientific Vocabulary end- + -stome; probably originally formed in French
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