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endostome

noun
en·​do·​stome | \ˈendəˌstōm\
plural -s

Definition of endostome 

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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History and Etymology for endostome

International Scientific Vocabulary end- + -stome; probably originally formed in French

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