出典:Wiktionary
From Proto-Italic (s)līwēō, *(s)leiwēō, or *(s)loiwēō[1], from Proto-Indo-European *(s)lih₃-wó-, suffixed form of *(s)leh₃y- (“bluish”). Also see 古期英語 slāh (“sloe”), Welsh lliw (“splendor, color”), Old Irish li, Lithuanian slywas (“plum”), Old Church Slavonic and Russian слива (sliva, “plum”). Alternatively, not being attested prior to Cicero, phonologically may only otherwise derive from līvidus, in which case the latter having an equivalent etymology.