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