Lewis & Short

pūsĭo, ōnis, m. [pusus].

  1. I. A little boy, Cic. Cael. 15, 36; id. Tusc. 1, 24, 57; Juv. 6, 34; Arn. 7, 215; Hier. Ep. 54, 4.
  2. II. Transf., a youth, lad: bellissimus, a pretty lad, App. M. 9, p. 220, 12.