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Definition of: amphithecium
(am′fə·thē′shē·əm, -sē·əm) noun plural ·ci·a (-shē·ə, -sē·ə) Bot.
The outer layer of cells surrounding the endothecium in the spore case of mosses. [ < NL < AMPHI- + Gk. thēkion, dim. of thēkē a case, container]
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