Entry 1 sense Webster, 1913 Dealfish /dēl'-fĭshˌ/ · Deal·fish · IPA /dˈiːlfˌɪʃ/ 01 n. A long, thin fish of the arctic seas (Trachypterus arcticus). 1. A long, thin fish of the arctic seas (Trachypterus arcticus).(Zool.)