Medius

·noun The third or middle finger; the third digit, or that which corresponds to it.

medius
mĕdĭus, a, um, adj. [Sanscr. madhya, the same; Gr. μέσος; Angl. - Sax. midd; Germ. Mitte; cf. dimidi...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
medius
medius (1) adj.MED-, in the middle, in the midst, mid, mean, middle : mundi locus: tempus: solio m...

An Elementary Latin Dictionary