Mumps \Mumps\, n. [Prov. E. mump to be sulky. Cf. Mump, Mumble, and Mum.]

1. pl. Sullenness; silent displeasure; the sulks. --Skinner.

2. [Prob. so called from the patient's appearance.]

(Med.) A specific infectious febrile disorder characterized by a nonsuppurative inflammation of the parotid glands; epidemic or infectious parotitis.

Source: Webster's Revised Unabridged Dictionary (1913)