Lewis Short
lūnŭla (noun F) : dim.1. luna
* A little moon, an ornament worn by women: aurea,Plaut. Ep. 5, 1, 33: lunulae sunt ornamenta mulierum in similitudinem lunae, bullulae aureae dependentes,Isid. Orig. 19, 31, 17; Tert. Cult. Fem. 2, 10.—Rarely of the luna worn by senators on their shoes: hac lunula nam adsuta calceis discernuntur patricii a noviciis, Schol. Juv. 7, 192; cf. luna, II. C.
Charlton T. Lewis, Charles Short, A Latin Dictionary