[{"Bold_text": "noun", "List Items": ["any of several venomous Old World snakes of the genus Vipera,especially V. berus,a small snake common in northern Eurasia.", "any related snakes belonging to the family Viperidae, characterized by erectile, venom-conducting fangs.", "pit viper pit viper.", "any of various venomous or supposedly venomous snakes.", "a malignant or spiteful person.", "a false or treacherous person.", "Viper,Military.a 9-pound (4-kilogram), shoulder-launched, unguided U.S. Army antitank rocket with an effective range of 273 yards (250 meters)."]}]