mandibular UK /manˈdɪb.jʊl.ə/US /mænˈdɪb.jəl.ɚ/ adjective1 •Of or pertaining to the mandible.The head produces a mandibular gland pheromone composed of ketones, the thorax lacks large glands, and the abdomen contains the venom and the Nasonov gland that produces lemon oil compounds. — 2016