Swelling caused by excess fluid trapped in body tissues, most commonly seen in the legs, ankles, and feet. Can result from heart failure, kidney disease, or local inflammation.
From Greek 'oidema' meaning 'a swelling,' from 'oidein' (to swell). The term has been used in medicine since ancient times, with Hippocrates describing various forms of swelling. The word entered English through Latin in the 14th century and has remained the standard medical term.
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