nătātĭlis — Lewis & Short
nătātĭlis, e, adj.id.,
I that can swim (post-class.):
animae,Tert. adv. Herm. 33. —Subst.: nătātĭles, ĭum, m., swimming creatures: feras, volucres, reptiles, natatiles, Prud. stef. 10, 332; App. de Mund. 28.