köken: From Proto-Indo-European *h₂eyd-. Cognates include Old Armenian այտ (ayt, “cheek”), այտնում (aytnum, “to swell”), Ancient Greek οἰδέω (oidéō, “to swell”) and Old English āte (English oat). This word is only attested in glosses.
köken: From Middle High German geswollen, past participle of swellen, from Proto-Germanic *swellaną. Cognate with German geschwollen. The root verb is not used in Yiddish; “to swell” is געשוואָלן ווערן (geshvoln vern, “to become swollen”).