an odd man out

an obscure retreat an obscure village an observation balloon an obstacle to progress an obtuse angle an odd lot an off chance an official residence an old bird an old campaigner an old head on young shoulders an old hen

osteoma medullare osteoma multiplex osteoma musculare osteoma sarcomatosum osteoma spongiosum osteomalacia osteomalacia chronica deformans hypertrophica osteomalacic osteomalacic pelvis osteomalacosis