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endosiphon
endosiphon n. 
/ˌɛndoʊˈsaɪf(ə)n/ the internal tube of certain cephalopods; siphuncle n. 1.
Brit. /ˌɛndə(ʊ)ˈsʌɪfn/
, /ˌɛndə(ʊ)ˈsʌɪfn/U.S. /ˌɛndəˈsaɪf(ə)n/
, /ˌɛndəˈsaɪf(ə)n//ˌɛndoʊˈsaɪf(ə)n/ΚΠ
1883 Hyatt in Proc. Boston Soc. Nat. Hist. 261 The ‘endosiphon’, here spoken of for the first time by that name, is the internal tube long known in Actinoceras, and lately demonstrated in Piloceras.
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as lemmas