endotheca

noun
en·​do·​theca | \¦endə+\
plural endothecae

Definition of endotheca 

: the tissue that partly fills the interior of the interseptal chambers of most madreporarian corals

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Other Words from endotheca

endothecal \ "+ \ adjective
endothecate \ "+ \ adjective

History and Etymology for endotheca

New Latin, from end- + theca

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