swine pox noun 1.obsolete: chickenpox < found her up and merry as it did not prove the smallpox but the swine pox — Samuel Pepys > 2.: a mild virus disease of young pigs marked by fever, loss of appetite, dullness, and production of skin lesions suggestive of those of smallpox and caused by either of two unrelated viruses, one of which is related to the viruses of smallpox and cowpox