ep·i·me·ron \ˌepəˈmiˌrän\noun (pluralepime·ra \-irə\) Etymology: New Latin, from epi- + -meron (from Greek mēros thigh) — more at member 1.: a lateral part of the wall of a somite of an arthropod that is situated between the tergum and the insertion of the appendages 2.: the posterior sclerite of a pleuron of an insect