plural noun
Meso·​nemertini | \¦me|(ˌ)zō, ¦mē|, |(ˌ)sō+\

Definition of Mesonemertini 

in some classifications

: an order of nemertea comprising the members of Palaeonemertea that have the mouth far behind the anterior end of the body

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History and Etymology for Mesonemertini

New Latin, from mes- + Nemertini

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to enclose within walls

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