c.1400, from Gk. oidema (gen. oidematos) "a swelling tumor," from oidein "to swell," from oidos "tumor, swelling," from PIE *oid- "to swell;" cf. L. aemidus "swelling," O.N. eista "testicle," O.E. attor "poison" (that which makes the body swell), and the first element in Oedipus.
(ĭ-dē'mə) An accumulation of an excessive amount of watery fluid in cells, tissues, or body cavities. Edema can be mild and benign as in pregnancy or prolonged standing in the elderly, or a serious sign of heart, liver, or kidney failure, or of other diseases.