Lewis & Short

an-năto (better adn-), āre, v. n.

  1. I. To swim to or toward: ei insulae crocodili non adnatant, Plin. 8, 25, 38, § 93; Jan here reads adnant; Sil. 10, 610.
    With ad: ad manum hominis adnatare, Plin. 9, 29, 46, § 87; 9, 10, 12, § 38.
  2. II. To swim along by or by the side of: comes lateri adnatat, Sen. Agam. 452.