ianus — de Vaan
ianus 'arched passage, doorway; god of gates and doors' [m. ο] (P1.+; w-stem only in Fest.; VLat. ienuarius, PRom. *ienua) Derivatives: ianua 'door, entrance' (P1.+), lanualis 'of Janus' (Varro), Ianuarius [adj.] '(month) of Janus' (Varro+), ianitor 'doorkeeper' (P1.+), ianitrix 'female doorkeeper' (PL+). Pit. *janu- 'door1. PIE *ieh2-n-u- 'passage'. IE cognates: Olr. ath 'ford, passage' < PCI. *jafl/-; Skt. — [de Vaan, s.v. ianus, p. 308]