: 1. A gland secreting an irritating or lethal substance.
2. (Arthropoda: Chelicerata) In true spiders, a pair of glands situated in the cephalothorax; in others, on the chelicerae with ducts traversing each claw with an oval slit opening near the tip.
3. (Arthropoda: Insecta) In Hymenoptera, the largest sting gland situated between the rectum and vagina and ending in the aculeus. See also apid venom gland, braconid venom gland, vespid venom gland.