Definition of tadpole noun from the Oxford Advanced Learner's Dictionary

 

tadpole

 noun
noun
BrE BrE//ˈtædpəʊl//
 
; NAmE NAmE//ˈtædpoʊl//
 
(North American English also polliwog) Amphibians and reptiles
 
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a small creature with a large head and a small tail, that lives in water and is the young form of a frog or toad See related entries: Amphibians and reptiles Word Origin late 15th cent.: from Old English tāda ‘toad’ + poll ‘head’ (probably because the tadpole seems to consist of a large head and a tail in its early development stage).
See the Oxford Advanced American Dictionary entry: tadpole