Lewis & Short

nāvĭger, ĕra, ĕrum, adj. [navis-gero].

  1. I. Ship-bearing, navigable: mare navigerum, Lucr. 1, 3: iter, Mart. 12, 99, 4.
  2. II. Sailing: navigera similitudo, the likeness of a vessel under sail; said of a sea-mussel, Plin. 9, 30, 49, § 94; v. nauplius.