1. basium — de Vaan
basium 'kiss' [n. o] (Cat+) Derivatives: basiare 'to kiss' (Cat.+). The recent date of attestation renders a loanword likely. Since Catullus, who introduced the word into the written language, was from Verona, it might have been Celtic, The original meaning of basium included an erotic connotation absent from osculum; in Imperial Latin, basium became the general word for 'kiss'. Many IE and non-IE languages contain … — [de Vaan, s.v. basium, p. 83]