Main Entry: wa·ter·shed

Pronunciation: \ˈwȯ-tər-ˌshed, ˈwä-\

Function: noun

Date: 1803

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

— watershed adjective