Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine
1. The youngaquaticlarva of any amphibian. In thisstage it breathes by means of outside or inside gills, is at firstdestitute of legs, and has a finlike tail. Called also polliwig, polliwog, porwiggle, or purwiggy.
2. The hooded merganser. Tadpole fish.
See Forkbeard .
Origin: OE. Tadde toad (AS. Tadie, tadige) + poll; properly, a toad that is or seems all head. See Toad, and Poll.
Source: Websters Vocabulary