1Now in form Megalops. A genus of marine fishes including the Indo-Pacific or ox-eye tarpon, Megalops cyprinoides, and the Atlantic tarpon, M. atlanticus (family Megalopidae).
2A free-swimming larval stage in the developments of crabs, following the zoea stage and having the adult number of trunk segments and legs, and large eyes; a crab in this stage.
Mid 19th century; earliest use found in Edward Griffith (1790–1858), naturalist. From scientific Latin Megalops from megalo- + -ops.