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endothecium
endothecium definition
endo·theci·um (en′dō t̸hē′s̸hē əm, -sē-)
noun pl. endothecia -·cia (-ə)
an inner layer, as the inner wall of a pollen grain or the inner layer of a moss capsule
Etymology: endo- + ModL -thecium, a fine enclosing structure < Gr thēkion, a small case, dim. of thēkē: see theca
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