John the Baptist johnt·he·bap·tist uncommon noun 1. (New Testament) a preacher and hermit and forerunner of Jesus (whom he baptized); was beheaded by Herod at the request of Salome SynonymsJohn the BaptistSt. John the Baptist Related words Broader terms hermitsaint WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.