sublingual gland n.
Either of two salivary glands situated in the mucus membrane on the floor of the mouth beneath the tongue. Also called Rivinus gland.
The swelling under the tongue called the “frog” is a disease of the sublingual gland.
It is usually due to an imperfect development of the duct of the submaxillary or sublingual gland.
The sublingual gland lies in the floor of the mouth just beneath the mucous membrane.