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The Collaborative International Dictionary of English v.0.48 (gcide)

Natant \Na"tant\, a. [L. natans, -antis, from swim, v. intens.
fr. nare to swim: cf. F. natant.]
1. (Bot.) Floating in water, as the leaves of water lilies,
or submersed, as those of many aquatic plants.
[1913 Webster]

2. (Her.) Placed horizontally across the field, as if
swimming toward the dexter side; said of all sorts of
fishes except the flying fish.
[1913 Webster]