Word Origin and History for tertiary Expand. adj. 1650s, of the third order, rank, degree, etc., from Latin tertiarius of or pertaining to a third, from tertius third, a third, from root of tres three (see three).
Water and Fluid retention in legs, also known as edema, is a medical condition caused by abnormal accumulation of water or fluids in the bodyâs tissues. Though excess water can be accumulated anywhere in the body, the most common areas are the ankles and legs.
Edema (water retention) & Swelling. Water retention is called Edema, which is the abnormal build up of fluid in the body. Edema is commonly seen in the feet and ankles. Because of the effect of gravity, swelling is particularly noticeable in these locations. But swelling due to water retention involves the enlargement of organs, skin, or other body structures.