·noun Top; summit; acme.
II. Culmen ·noun The dorsal ridge of a bird's bill.
culmen, ĭnis, contr. form of columen, q. v. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
culmen inis, n for columen, the top, summit, roof, gable : mersae culmina villae, O.: tuguri, V.: ...
An Elementary Latin Dictionary