articulamentum

noun
ar·​tic·​u·​la·​men·​tum | \ärˌtikyələˈmentəm\
plural articulamenta\-​tə \

Definition of articulamentum 

: the inner layer of a plate of a chiton projecting anteriorly and articulating with the plate in front — compare tegumentum

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History and Etymology for articulamentum

New Latin, from Latin, articulation of the limbs, joint, from articulare to divide into joints + -mentum -ment

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