universal time (UT)—Same as Greenwich mean time (GMT). See time, kinds.

uplands— Land above the mean high water line (shoreline) and subject to private ownership, as distinguished from tidelands, the ownership of which is prima facie in the state but also subject to divestment under state statutes. See tidelands.

upwelling—An upward flow of subsurface water due to such causes as surface divergence, offshore wind, and wind drift transport away from shore.