"wet, swampy tract," 1655, from Du.
moeras "marsh, fen," from M.Du.
marasch, from O.Fr.
marais "marsh," from Frank., possibly from W.Gmc.
*marisk, from P.Gmc.
*mariskaz "like a lake," from
*mari "sea." The M.Du. word was infl. by Du.
moer "moor" (see
moor (n.)). Fig. use is attested from 1867.