12-Letter Words Starting: OST

• extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic

• therapy based on the assumption that restoring health is best accomplished by manipulating the skeleton and muscles

• malignant bone tumor; most common in children and young adults where it tends to affect the femur

• abnormal softening of bones caused by deficiencies of phosphorus or calcium or vitamin D

• abnormal loss of bony tissue resulting in fragile porous bones attributable to a lack of calcium; most common in postmenopausal women