a. 浮在水上的, 漂浮的, 游泳的

[医] 浮游的

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.

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