Edema

google

ref

late Middle English: modern Latin, from Greek oidēma, from oidein ‘to swell’.

wiktionary

ref

From New Latin edema, from Ancient Greek οἴδημα(oídēma, “swelling”), from οἰδέω(oidéō, “I swell”).

etymonline

ref

edema (n.)

also oedema, "excessive accumulation of serum in tissue spaces or a body cavity," c. 1400, idema, "a swelling filled with phlegmatic humors," from medical Latin, from Greek oidēma (genitive oidēmatos) "a swelling tumor," from oidein "to swell," from oidos "tumor, swelling," from PIE *oid- "to swell," source also of Latin aemidus "swelling;" Armenian aitumn "a swelling," aytnum "to swell;" Old Norse eista "testicle," Old High German eittar "pus," Old English attor "poison" (that which makes the body swell), and the first element in Oedipus.