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endothecium Definition

endo·theci·um (en′dō t̸hē′s̸hē əm, -sē-)

noun pl. -·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