'Bullfrog' definitions:
Definition of 'bullfrog'
From: WordNet
noun
Largest North American frog; highly aquatic with a deep- pitched voice [syn: bullfrog, Rana catesbeiana]
Definition of 'Bullfrog'
From: GCIDE
- Bullfrog \Bull"frog`\, n. (Zool.) A very large species of frog (Rana Catesbiana), found in North America; -- so named from its loud bellowing in spring. [1913 Webster]