Morass \Mo*rass"\, n. [OE. marras, mareis (perh. through D. moeras), fr. F. marais, prob. from L. mare sea, in LL., any body of water; but perh. influenced by some German word. See {Mere} a lake, and cf. {Marsh}.] A tract of soft, wet ground; a marsh; a fen. [1913 Webster] {Morass ore}. (Min.) See {Bog ore}, under {Bog}. [1913 Webster]