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exotheca
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exotheca n. 
/ˌɛksoʊˈθikə/ Zoology the hard exterior wall of the gonosome of the Hydrozoa. [After French exothèque (1833 or earlier).]
Brit. /ˌɛksə(ʊ)ˈθiːkə/
, /ˌɛksə(ʊ)ˈθiːkə/U.S. /ˌɛksəˈθikə/
, /ˌɛksəˈθikə//ˌɛksoʊˈθikə/<
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