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Ober test Occam razor (principle of parsimony) Ochoa syndrome Ochsner muscle Ockelbo disease Ockuly-Montgomery syndrome (lichenoid tuberculid) Odland body Odland prosthesis Ogden classification Ogilvie syndrome (adynamic colonic ileus) Ogston line Oguchi syndrome Ohdo syndrome (blepharo-phimosis) Ohm acoustic law Oilier approach Oilier disease (enchondromatosis) Oilier layer Oilier retractor Okuda groups Olshausen suspension Ommaya reservoir Omsk fever Onanism (coitus interruptus) Ondine curse Onuf nucleus (Onufrowicz nucleus) OÕBrien block (akinesia, Nadbath-Rehman technique) OÕBrien syndrome (actinic granuloma) OÕConnor operation (ÒcinchÓ operation) OÕConnor scope OÕConnor wiggly block OÕSulllvan-OÕConnor abdominal retractor Opitz syndrome (C-trigonocephaly syndrome) Opltz syndrome Oppel illusion (Oppel-Kundt illusion) Oppenheim reflex Oppenheim sign Oppenheim-Scholz-Morel syndrome (dysphoric angio-pathia) Oppenheim-Urbach syndrome (necrobiosis lipoidica) Orbison illusion Oregon Polyz prosthesis Oregon prosthesis Oreopoulos-Zellerman disc Orestes complex organ of Corti organ of Giralds (para-didymis) organ of Rosenmiiller (epo-ophoron) organ of Zuckerkandl Oriental boil Orkel syndrome (multiple epiphyseal dysplasia type 4) Ormond disease Oropouche fever Oroya fever Orringer procedure Orrunga treatment Ortner syndrome Ortolani sign Orzechowski syndrome Osborne wave (J wave) Osebold-Remondini syndrome (type 6 brachydactyly) Osgood-Schlatter disease Osier disease Osier nodes Osler-Vaquez disease Osserman classification Ossoff-Pilling microlaryn-goscope Ostertag disease Ostertagia Ostrum-Furst syndrome Ostwald color atlas Osuntokun disease Ota disease Othello syndrome Otis quick scoring mental ability tests Ottawa ankle rules Otto Bock hand Otto disease Ottoson potential (elect ro-olfactogram) Ouchterlony immuno-diffusion (double diffusion technique) Oudin immunodiffusion (single diffusion technique) Owen lines Owren disease (parahe-mophilia) Ozeran technique Ozzard filaria (Mansonella ozzardi, mansonelliasis)