The Collaborative International Dictionary of English v.0.48:
Orchitis \Or*chi"tis\, n. [NL., fr. Gr. ? a testicle + -itis.] (Med.) Inflammation of the testicles. [1913 Webster]WordNet (r) 3.0 (2006):
orchitis n 1: inflammation of one or both testes; characterized by pain and swelling