pectuscŭlum

i, n.

pectus

I. a little breast (late Lat.), Hier. Ep. 22, n. 30: pectus, pectusculum, Not. Tir. p. 58; Vulg. Exod. 29, 26; id. Num. 6, 20.
Lewis & Short
A Latin Dictionary, 1879
An open-access project