With afterwards shortening on the vowel. The this means "a divide of land" (feeling two), attested previously in watershed (18th century) seems to be an outgrowth of previously Bodily senses in the term, as "the Component of just one's hair" or "a passageway between the threads of the warp on https://imperial98753.ageeksblog.com/27501839/shed-for-dummies