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.
Swollen legs feet and ankles are caused by water retention. When your circulation has problems working against the effects of gravity, your blood collects in the lower part of your body. The extra pressure on your blood vessels makes them leak fluid into the tissues of your legs feet and ankles.