The American Heritage® Dictionary of the English Language, 4th Edition
n. A developmental defect marked by the failure of the testes to descend into the scrotum.
The Century Dictionary and Cyclopedia
n. Retention of the testicles in the cavity of the abdomen, owing to the failure of the organs to descend from their primitive position into the scrotum. Also cryptorchidism, cryptorchismus.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. failure of one or both testes to move into the scrotum as the male fetus develops
Word Usage
"The testis, developed in the lumbar region, may be arrested or delayed in its transit to the scrotum (cryptorchism)."