One of the mysteries of the English language finally explained.
A tumour or swelling located in the floor of the mouth beneath the tongue; specifically a bluish, domed mucocele arising from a sublingual salivary gland.
Late Middle English; earliest use found in Guy de Chauliac's Grande Chirurgie. From classical Latin rānula little frog (2nd cent. a.d.), in post-classical Latin also small swelling under the tongue of cattle from rāna frog + -ula.
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