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.
Leg and feet swelling that occurs with diseases of the heart, liver and kidneys is caused by salt retention holding excess fluid in the body, states MedicineNet. Edema is a normal response of the body to inflammation or injury and it is also caused by medical problems, notes WebMD. Keep Learning.