Death due to disease is called death by natural causes. There are four main types of disease: pathogenic disease, deficiency disease, hereditary disease, and physiological disease. Diseases can also be classified as communicable and non-communicable disease.
A watershed is the area of land where all of the water that falls in it and drains off of it goes to a common outlet.
Full Definition of WATERSHED. 1. a: divide 2a b: a region or area bounded peripherally by a divide and draining ultimately to a particular watercourse or body of water. 2.: a crucial dividing point, line, or factor: turning point. â watershed adjective.See watershed defined for English-language learners.ull Definition of WATERSHED. 1. a: divide 2a b: a region or area bounded peripherally by a divide and draining ultimately to a particular watercourse or body of water. 2. : a crucial dividing point, line, or factor: turning point. â watershed adjective. See watershed defined for English-language learners.