rānŭla, ae, f. dim. [rana].
I Lit., a little frog , a tadpole , Ap. Met. 9, 34, 13. —
II Transf., a little swelling on the tongue of cattle , Veg. 4, 5, 1 al.
·noun A cyst formed under the tongue by obstruction of the duct of the submaxillary gland. ...
Webster's Dictionary of the English Language