The Collaborative International Dictionary of English v.0.48:
Natterjack \Nat"ter*jack`\, n. (Zool.) A European toad (Bufo calamita), having a yellow line along its back. [1913 Webster]WordNet (r) 3.0 (2006):
natterjack n 1: common brownish-yellow short-legged toad of western Europe; runs rather than hops [syn: natterjack, Bufo calamita]