Noun | 1. | cryptorchism - failure of one or both testes to move into the scrotum as the male fetus develops undescended testicle, undescended testis - a testis that fails to move into the scrotum as the male fetus develops; "undescended testicles have an increased risk for cancer" monorchidism, monorchism - failure of one testes to descend into the scrotum abnormalcy, abnormality - an abnormal physical condition resulting from defective genes or developmental deficiencies |