Natant
Natant , adjective
[Latin natans, -antis, from swim, v. intens. from nare to swim: compare French natant.]
1.
(Botany) Floating in water, as the leaves of water lilies, or submersed, as those of many aquatic plants.
2.
(Heraldry) Placed horizontally across the field, as if swimming toward the dexter side; said of all sorts of fishes except the flying fish.