[1] : The Collaborative International Dictionary of English v.0.48

parotitis \par`oti"tis\, n. nl. see parotid, and -itis.
   med.
   inflammation of the parotid glands.
   1913 webster

   epidemic parotitis or infectious parotitis, mumps.
      1913 webster
see also:
parotid -itis epidemic parotitis infectious parotitis 

[2] : The Collaborative International Dictionary of English v.0.48

mumps \mumps\, n. prov. e. mump to be sulky. cf. mump,
   mumble, and mum.
   1. pl. sullenness; silent displeasure; the sulks. --skinner.
      1913 webster

   2. prob. so called from the patient's appearance. med. a
      specific infectious febrile disorder characterized by a
      nonsuppurative inflammation of the parotid glands, and
      sometimes causing inflammation of the testes or ovaries;
      also called epidemic parotitis or infectious
      parotitis. it is caused by infection with a
      paramyxovirus.
      1913 webster +pjc
see also:
mump mumble mum epidemic parotitis infectious parotitis 

[3] : WordNet (r) 2.0

epidemic parotitis
     n : an acute contagious viral disease characterized by fever and
         by swelling of the parotid glands syn: mumps
see also:
mumps 

Parotitis >> P Words
Parotitis, definition of term: Parotitis
parotitis_pag1.html

Epidemic >> E Words
Epidemic, definition of term: Epidemic
epidemic_pag1.html