Lacertus | Webster's Dictionary of the English Language

lacertus
lăcertus, i, m., the muscular part of the arm, from the shoulder to the elbow, the upper arm. I Li...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
lacertus
lacertus (1) ī, m 2 LAC-, the muscular part of the arm from the shoulder to the elbow, upper arm :...

An Elementary Latin Dictionary