swimming or floating; esp., floating on the surface
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
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Word origin of 'natant'L natans, prp. of natare, to swim < IE *(s)net- < base *(s)na-, to flow > Gr nēchein, to swim, nēsos, island, L nare, to swim, OIr snām, swimming