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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.
[transâ²yÉdÄt]. Etymology: L, trans + sudare, to sweat. a fluid passed through a membrane or squeezed through a tissue or into the space between the cells of a tissue. It is thin and watery and contains few blood cells or other large proteins. See also edema.