cryptorchidy cryp·torc·hidy uncommon noun 1. failure of one or both testes to move into the scrotum as the male fetus develops Synonymscryptorchidismcryptorchism Related words Broader terms abnormality Narrower terms monorchism Part of undescended testis WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.