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en·do·the·ci·um | \ ˌen-dō-ˈthē-sē-əm 
, -shē- \
, -shē- \ plural endothecia\ ˌen-dō-ˈthē-sē-ə , -shē- \
, -shē- \Definition of endothecium
: the inner lining of a mature anther
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The first known use of endothecium was in 1832
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