amphibious

adjective

1. living or able to live both on land and in water; belonging to both land and water.
2. Also amphibian. capable of operating on both land and water: amphibious vehicles.
3. of or relating to military operations by both land and naval forces against the same object, especially to a military attack by troops landed by naval ships.
4. trained or organized to fight, or fighting, on both land and sea: amphibious troops.
5. combining two qualities, kinds, traits, etc.; of or having a mixed or twofold nature.

adjective

1. able to live both on land and in the water, as frogs, toads, etc
2. designed for operation on or from both water and land
3. relating to military forces and equipment organized for operations launched from the sea against an enemy shore
4. having a dual or mixed nature