am·phib·i·ous 
(ăm-fĭbē-əs)
(ăm-fĭbē-əs)adj.
1. Biology Living or able to live both on land and in water.
2. Able to operate both on land and in water: amphibious tanks.
3. Relating to or organized for a military landing by means of combined naval and land forces.
4. Of a mixed or twofold nature.
[From Latin amphibius, from Greek amphibios; see AMPHIBIAN.]
am·phibi·ous·ly adv.
am·phibi·ous·ness n.