1. cascus — de Vaan
cascus 'old' [adj. o/a] (Enn,+) Pit *kas-ko- 'grey'. PIE *kh|S-ko- / *kh2(e)s-ko-. IE cognates: see s.v. canus. Possibly, cascus was used pejoratively, cf. caecus 'blind', luscus 'one-eyed, cross-eyed', which also have *-£*>-. The meaning 'old' probably developed from 'old of age' < 'having white hair'; compare NHG Greis, MoDu. grijsaard 'old man\ Lat. cascus never occurs in Latin texts: all attestations are … — [de Vaan, s.v. cascus, p. 110]