define submandibular gland
submandibular gland - a salivary gland inside the lower jaw on either side that produces most of the nocturnal saliva; discharges saliva into the mouth under the tongue. mandibular gland, submandibular salivary gland, submaxillary gland, submaxillary salivary gland. salivary gland - any of three pairs of glands in the mouth and digestive system that secrete saliva for digestion.