Etymology
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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.

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Definitions of edema

edema (n.)
swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities;
Synonyms: oedema / hydrops / dropsy
From wordnet.princeton.edu