noun Download 🔗Share Any long slender primitive eel-like freshwater and saltwater fish of the order Petromyzontiformes, having a sucking mouth with rasping teeth but no jaw. Examples : "The fisherman was surprised to find a lamprey attached to the side of the large trout he had caught, its toothy, sucking mouth firmly latched on. " fish animal biology Chat with AIVocabulary GamePractice Reading