Lewis & Short

in-no, āvi, ātum, 1, v. n., to swim or float in or upon.

  1. I. Lit.
    1. A. Partim submersae, partim fluitantes et innantes beluae, Cic. N. D. 2, 39, 100: innare contextis ratibus, Amm. 14, 2, 10: innabant pariter fluctusque secabant, Verg. A. 10, 222: innare aquae, Liv. 21, 26, 9: fluviis, Col. poët. 10, 388.
      Of vessels, a fleet, etc.: quo levior classis vadoso mari innaret, Tac. A. 1, 70: pelago, Sil. 12, 448.
      With acc.: rapaces fluvios, Verg. G. 3, 142: fluvium vinclis innaret Cloelia ruptis, Verg. A. 8, 651.
      With abl.: aquā, Suet. Ner. 12.
    2. B. To flow upon, to wash: innantem Maricae littoribus Lirim, Hor. C. 3, 17, 7.
  2. II. Transf., to sail upon, navigate: Stygios lacus, Verg. A. 6, 134.