Amphibious \Am*phib"i*ous\, a. [Gr. 'amfi`bios living a double life, i. e., both on land in water; 'amfi` + bi`os life.]

1. Having the ability to live both on land and in water, as frogs, crocodiles, beavers, and some plants.

2. Pertaining to, adapted for, or connected with, both land and water.

The amphibious character of the Greeks was already determined: they were to be lords of land and sea. --Hare.

3. Of a mixed nature; partaking of two natures.

Not in free and common socage, but in this amphibious subordinate class of villein socage. --Blackstone.

Source: Webster's Revised Unabridged Dictionary (1913)