GNU Collaborative International Dictionary of English

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1.       
   Morass , 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