The definition of a tadpole is the young stage of an amphibian, it lives in water, has a tail and breaths through gills.(noun)
An example of a tadpole is the stage a toad is in before it gets legs and lungs for breathing outside of the water.
See tadpole in Webster's New World College Dictionary
Origin: ME taddepol < tadde, toad + poll, head, hence, toad that seems all head
See tadpole in American Heritage Dictionary 4
Origin: Middle English taddepol
Origin: : tadde, tode, toad; see toad
Origin: + pol, head; see poll.
tadpole in four stages of development
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