Proto-IE: *swerd- (Gr s-)
Meaning: to laugh
Old Greek: sardázdẹ̄n = metà pikrías gelôn Phot., Suid.; sardánion (meidiân, gelân), sardánios gélōs `bitter, höhnisch lächeln, lachen; höhnisches Gelächter'. LS: The common expl. given of this laugh was that it resembled the effect produced by a Sardinian plant (Ranunculus sardous, Sardinian vrowfoot, called sardánē by Tz. ad Hes.Op.59, sardónion by Ps.-Disoc., etc., which when eaten srewed up the face of the eater; whence later authors wrote sardónion or sardṓnion (from Sardṓ) for sardánion <...> and sardónios appears as a v.l. in Hom. and Pl.
Celtic: *swerd- > Cymr chwarddu, Corn hwerthin, MBret huersin 'lachen'
Russ. meaning: смеяться
