endothecium
noun
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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