OP

Abbreviation for occipitoposterior position.

* * *

occipitoparietal; occipitoposterior; occiput posterior; octapeptide; olfactory peduncle; opening pressure; operation, operative; operative procedure; ophthalmology; opponens pollicis; optic neuritis; organophosphate; oropharynx; orthostatic proteinuria; osmotic pressure; osteoporosis; outpatient; ovine prolactin