epi·​sternum | \¦epə̇, ¦epē+\
plural episterna

Definition of episternum 

1a : interclavicle

b : any of several other sternal elements of similar origin or position (such as the presternum of a mammal or the epiplastron of a turtle)

2 : a lateral division or piece of a somite of an arthropod specifically : the anterior sclerite of the pleuron of an insect — compare epimeron

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History and Etymology for episternum

New Latin, from epi- + sternum

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