am·phib·i·ous ( m-f b  - s)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·phib i·ous·ly adv.am·phib i·ous·ness n. |
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