| OR | a logical binary relation that is true if any argument is true, and false otherwise; [o]estrogen rec... |
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| ORALABX | oral antibiotics |
| ORD | optical rotatory dispersion; oral radiation death |
| OROS | oral osmotic |
| ORT | object relations technique; operating room technician; oral rehydration therapy |
| oral physiotherapy | The use of a toothbrush, interdental stimulator, floss, irrigating device, or other adjunctive aid to maintain oral health Origin: physio-+ G. Therapeia, treatment (05 Mar 2000) |
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| oral plate | A circumscribed area of fusion of foregut endoderm and stomodeal ectoderm in the embryo which breaks through early in development to establish the oral opening. See: buccopharyngeal membrane. (05 Mar 2000) |
| oral polio vaccine | <drug> A live vaccination, administered orally to children for protection against the polio virus. Typically given at 2, 4 and 15 months. A final oral vaccine is recommended at 4-6 years. (27 Sep 1997) |
| oral poliovirus vaccine | An aqueous suspension of live, attenuated strains of poliomyelitis virus (types 1, 2, and 3) given orally for active immunization against poliomyelitis. See: Sabin vaccine. Synonym: poliomyelitis vaccines. (05 Mar 2000) |
| oral region | The region of the face including the lips and mouth. Synonym: regio oralis. (05 Mar 2000) |
| oral shields | Removable appliances used in orthodontic treatment, usually placed between the labial and buccal mucosa and the teeth. (05 Mar 2000) |
| oral smear | A group of cytologic specimens containing material from the mouth (oral smear), oesophagus and stomach (gastric smear), duodenum (paraduodenal smear), and colon, obtained by specialised lavage techniques; used principally for the diagnosis of cancer of those areas. (05 Mar 2000) |
| oral stage | The earliest of the stages of infantile psychosexual development, lasting from birth to 12 months or longer. (12 Dec 1998) |
| oral stereotypy | Constant repetition of meaningless words or phrases; seen in schizophrenia. Synonym: catalogia, cataphasia, oral stereotypy. Origin: L. Verbum, word, + gero, to carry about (05 Mar 2000) |
| oral submucous fibrosis | A precancerous condition of the oral mucosa and upper aerodigestive tract characteristically in a native of India. (05 Mar 2000) |
| oral surgeon | <specialist> A physician specialist expert in the surgical treatment of the jaw, face, teeth and associated structures. (11 Jan 1998) |
| oral surgery | The branch of dentistry concerned with the diagnosis and surgical and adjunctive treatment of diseases, injuries, and deformities of the oral and maxillofacial region. (05 Mar 2000) |
| oral surgical procedures | Procedures used to treat disease, injuries, and defects of the oral and maxillofacial region. (12 Dec 1998) |
| oral surgical procedures, preprosthetic | Surgery necessary for a denture to rest on a firm base, free from marked osseous protuberances or undercuts, and devoid of interfering muscle attachments, excess mucoperiosteum, hyperplasias, and fibrous or papillary growths. (12 Dec 1998) |
| oral teeth | <dentistry> Your centrals, laterals, and cuspids. These are the teeth in the front of your mouth. (08 Jan 1998) |