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endothecal
endothecal adj. 
/ˌɛndoʊˈθik(ə)l/ (dissepiments) horizontal plates growing inwards from the septa of a corallite ( New Sydenham Soc. Lexicon).
Brit. /ˌɛndə(ʊ)ˈθiːkl/
, /ˌɛndə(ʊ)ˈθiːkl/U.S. /ˌɛndəˈθik(ə)l/
, /ˌɛndəˈθik(ə)l//ˌɛndoʊˈθik(ə)l/ΚΠ
1833 Athenæum 10 Feb. 188/3 Edwards and Haime described..the absence of endothecal dissepiments.
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