| 1. | Pathology. any of various skin diseases marked by the shedding of branlike scales of epidermis. |
| 2. | Veterinary Pathology. a skin disease in various domestic animals marked by dry scales. |

pityriasis pit·y·ri·a·sis (pĭt'ĭ-rī'ə-sĭs)
n. pl. pit·y·ri·a·ses (-sēz')
Any of various skin diseases of humans and animals, characterized by epidermal shedding of flaky scales.