The term VENOM SOURCE can be broken down into three crossword solutions: ASP (3 letters), FANG (4 letters), and PITVIPER (8 letters). An ASP is a type of venomous snake found in Africa and the Middle East. Its venom is highly toxic and can cause death. A FANG is a long, sharp tooth found in some animals, such as snakes, that is used to inject venom into their prey. Pitvipers are a group of venomous snakes found in North, Central, and South America. They have large fangs and produce a powerful venom that can cause severe pain and swelling. All three of these creatures are sources of venom and can be dangerous if not handled properly.