Source : Webster's Revised Unabridged Dictionary (1913)

Hydrocele \Hy`dro*cele\, n. [L., fr. Gr. ?; "y`dwr water + ?
   tumor.] (Med.)
   A collection of serous fluid in the areolar texture of the
   scrotum or in the coverings, especially in the serous sac,
   investing the testicle or the spermatic cord; dropsy of the
   testicle.

Source : WordNet®

hydrocele
     n : disorder in which serous fluid accumulates in a body sac
         (especially in the scrotum)