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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.
generalized edema edema that is caused by poor venous return; it is not localized by the effects of gravity, in contrast to dependent edema. interstitial edema 1. edema caused by the accumulation of fluid in the extracellular spaces of a tissue.