A cyst on the underside of the tongue

WordNet Word definitions in WordNet
n. a cyst on the underside of the tongue [also: ranulae (pl)]

Wiktionary Word definitions in Wiktionary
n. A small cyst on the floor of the mouth, under the tongue, which is associated with an obstruction of the major salivary gland.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ranula \Ran"u*la\ (r[a^]n"[-u]*l[.a]), n. [L., a little frog, a little swelling on the tongue of cattle, dim. of rana a frog.] (Med.) A cyst formed under the tongue by obstruction of the duct of the submaxillary gland.

Wikipedia Word definitions in Wikipedia
A ranula is a type of mucocele found on the floor of the mouth. Ranulas present as a swelling of connective tissue consisting of collected mucin from a ruptured salivary gland caused by local trauma. If small and asymptomatic further treatment may not be ...