Proto-IE: *yes- (Gr zd-)
Meaning: to boil
Tokharian: A, B yäs- 'excite, excite sexually' (Adams 500)
Old Indian: yasati, yásyati `to froth up, foam; to strive after'
Avestan: yaēšyeiti `siedet (intr.)'
Old Greek: zdéō, aor. zdé(s)sai̯, ezdésthai, pf. ézdesmai̯ `kochen, wallen, sieden (intr.)'; zdéma n. `das Kochen, Dekokt', zdóē = tò epánō toû mélitos Hsch.
Germanic: *jís-a- vb.; *jṓs-a- adj.; *jṓs-ia- vb., *jḗs-ia- vb., *jis-tu- c., *jis-t-a- n., *jaz-já- vb.
Celtic: Cymr ias `fervor, ebullitio'
Russ. meaning: кипеть, кипятить
