. . . . . . . . refers to the undescended condition of the testes into the scrotal sac.

Cryptorchidism refers to the undescended condition of the testes in the scrotal sac.
Cryptorchidism, also known as undescended testis, is the failure of one or both testes to descend into the scrotum.
It is the most common birth defect of the male genital tract. About 3% of full-term and 30% of premature infant boys are born with at least one undescended testis.