Chelicerae

The chelicerae (or one chelicera) are the mouth pieces of a spider. They are attached by joints to the front of a spider's cephalothorax between the pedipalps, and have fangs (usually hollow) on the unattached point. They often contain the spider's venom glands but not always and in spiders that don't have venom glands they obviously don't have venom glands (although they can still have hollow fangs for evolutionary reasons).