Lewis & Short

prae-năto, āre, v. n.

  1. I. To swim before or in front: praenatans musculus, Plin. 9, 62, 88, § 186: praenatante pisciculo, id. 9, 45, 68, § 146.
  2. II. To swim or flow by: domos praenatat amnis, Verg. A. 6, 705.