What does OP stand for?

Osburn Public

Oscar Pistorius

Outer Planes

Outer Planet

Outfield Players

Outlet Pressure

Osteopathic Physician

Osteopetrosis

Osteopetrosis is an extremely rare inherited disorder whereby the bones harden, becoming denser, in contrast to more prevalent conditions like osteoporosis, in which the bones become less dense and more brittle, or osteomalacia, in which the bones soften. Osteopetrosis can cause bones to dissolve and break.

Osteopetrotic