semirotundus

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

sēmĭ-rŏtundus, a, um, adj.,

half-round , semicircular (Apuleian): subterraneum, Ap. Met. 11, 6, 24; suggestus, id. ib. 5, 3, 4.