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Edema. Edema or oedema, formerly known as dropsy or hydropsy, is an abnormal accumulation of fluid in the interstitium, which are locations beneath the skin or in one or more cavities of the body. It is clinically shown as swelling.dema or oedema, formerly known as dropsy or hydropsy, is an abnormal accumulation of fluid in the interstitium, which are locations beneath the skin or in one or more cavities of the body.
Definition of edema 1: an abnormal infiltration and excess accumulation of serous fluid in connective tissue or in a serous cavity â called also dropsy 2 a: watery swelling of plant organs or parts