collacteus

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

col-lactĕus (conl-), a,

a foster-brother , foster-sister; masc. , Hyg. Fab. 224; Inscr. Orell. 678; fem. , Juv. 6, 307; Mart. Cap. 1, § 6; 2, § 111.