noun: (UK, sometimes capitalized) A working-class punk rock subgenre of the 1970s, sometimes associated with racism.
noun: (medicine) Initialism of opportunistic infection. [(medicine) Any infection that causes disease and occurs only when the host's immune system is impaired.]
noun: (medicine) Initialism of osteogenesis imperfecta. [(pathology) A hereditary disease characterized by brittle bones that easily fracture.]
