Lewis & Short

1. cilo, ōnis, m., having a prominent forehead pressed in upon the sides, Fest. p. 43, 10; cf. Charis. 1, p. 78 P.; a dim. of it, cilunculus, Arn. 3, 14.

2. Cīlo, ōnis, m., a Roman cognomen, Cic. Fam. 4, 12, 2.