Cryptorchidism is a medical condition in which the testicles fail to descend into the scrotum. The condition is also known as undescended testicles. Some synonyms for cryptorchidism include maldescended testes, retained testes, and unilateral testicular absence. These terms are used to describe the same condition, where the testes are not in their normal anatomical position. Other synonyms for cryptorchidism include anorchia, monorchidism, and agenesis testis. These words are less commonly used but still refer to the same condition of undescended or missing testicles. It is important to note that cryptorchidism requires medical attention and intervention to prevent potential complications.