| ORD | optical rotatory dispersion; oral radiation death |
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| OROS | oral osmotic |
| ORT | object relations technique; operating room technician; oral rehydration therapy |
| OS | left eye [Lat. oculus sinister]; occipitosacral; occupational safety; office surgery; Omenn syndrome... |
| OSCC | oral squamous cell carcinoma |
| 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) |
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| 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) |
| oral ulcer | A loss of mucous substance of the mouth showing local excavation of the surface, resulting from the sloughing of inflammatory necrotic tissue. It is the result of a variety of causes, e.g., denture irritation, aphthous stomatitis (stomatitis, aphthous), noma, necrotizing gingivitis (gingivitis, necrotizing, ulcerative), toothbrushing, and various irritants. (12 Dec 1998) |
| oral vestibule | That part of the mouth bounded anteriorly and laterally by the lips and the cheeks, posteriorly and medially by the teeth and/or gums, and above and below by the reflections of the mucosa from the lips and cheeks to the gums. Synonym: vestibulum oris, buccal cavity, vestibule of mouth. (05 Mar 2000) |
| tuberculosis, oral | Tuberculosis of the mouth, tongue, and salivary glands. (12 Dec 1998) |
| florid oral papillomatosis | Diffuse involvement of the lips and oral mucosa with benign squamous papillomas; microscopically, it resembles verrucous carcinoma, but is not invasive or localised to a specific area of the oral mucosa. (05 Mar 2000) |
| leukoedema, oral | A disorder of the buccal mucosa resembling early leukoplakia, characterised by the presence of filmy opalescence of the mucosa in the early stages to a whitish gray cast with a coarsely wrinkled surface in the later stages, associated with intracellular oedema of the spinous or malpighian layer. (12 Dec 1998) |
| leukoplakia, oral | A white patch seen on the oral mucosa. It is considered a premalignant condition and is often tobacco-induced. When evidence of epstein-barr virus is present, the condition is called hairy leukoplakia (leukoplakia, hairy). (12 Dec 1998) |