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entoseptum
entoseptum n.
Brit. 
/ˌɛntə(ʊ)ˈsɛptəm/
, /ˌɛntə(ʊ)ˈsɛptəm/U.S. /ˌɛn(t)əˈsɛptəm/
in corals, a septum developed interiorly./ˌɛn(t)əˈsɛptəm/ΚΠ
1885 G. H. Fowler in Q. Jrnl. Microsc. Sci. XXV. 578 The septa lying in these two classes of chambers are similarly called exosepta and entosepta.
1903 Ann. & Mag. Nat. Hist. Feb. 147 The union of the entoseptum within each pair of the second cycle mesenteries with the adjoining exosepta.
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