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bull-frog

ˈbull-ˌfrog
  [f. bull n.1 + frog.]
  The name given to certain large American frogs, esp. Rana pipiens, a species 6 or 8 inches long, which has a voice not unlike that of a bull.

1738 Mortimer Nat. Hist. Carolina in Phil. Trans. XL. 348 The Bull-Frog. This hath its English Name from its Noise, which seems not unlike the Bellowing of a Bull at a Distance. 1795 Wolcott (P. Pindar) Lousiad iii. Wks. 1812 I. 248 The Bull-frog's snore. 1824 W. Irving T. Trav. (1849) 384 The bull-frog croaked dolefully from a neighboring pool. 1855 Longfellow Hiaw. ix. 118 And the bull-frog, the Dahinda, Thrust his head into the moonlight.

Oxford English Dictionary

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