| Oriboca virus | A C group virus of the genus Bunyavirus, and an agent of bunyavirus encephalitis. (05 Mar 2000) |
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| oriental | 1. A native or inhabitant of the Orient or some Eastern part of the world; an Asiatic. 2. Eastern Christians of the Greek rite. Of or pertaining to the orient or east; eastern; concerned with the East or Orientalism; opposed to occidental; as, Oriental countries. "The sun's ascendant and oriental radiations." (Sir T. Browne) Origin: L. Orientalis: cf. F. Oriental. Source: Websters Dictionary (01 Mar 1998) |
| Oriental boil | The lesion occurring in cutaneous leishmaniasis. (05 Mar 2000) |
| Oriental button | The lesion occurring in cutaneous leishmaniasis. (05 Mar 2000) |
| oriental cholangio-hepatitis | <radiology> Recurrent pyogenic hepatitis, pyogenic cholangitis, seen in Orient and in Asian immigrants, aetiology: Clonorchis sinensis (?), stones, dilated ducts filled with stones, soft, pigmented stones most likely to be no shadow on ultrasound, stricture, obstruction, abscess, increased incidence of cholangiocarcinomarcinoma Differential diagnosis: sclerosing cholangitis, Caroli disease (12 Dec 1998) |
| Oriental ringworm | An eruption consisting of a number of concentric rings of overlapping scales forming papulosquamous patches scattered over the body; it occurs in tropical climates and is caused by the fungus Trichophyton concentricum. Synonym: herpes desquamans, Malabar itch, Oriental ringworm, scaly ringworm, tinea tropicalis, Tokelau ringworm. (05 Mar 2000) |
| Oriental schistosomiasis | Schistosomiasis caused by schistosoma japonicum. It is endemic in the far east and affects the bowel, liver, and spleen. (12 Dec 1998) |
| Oriental sore | <disease> Skin disease caused by the flagellate protozoan, Leishmania tropica. (18 Nov 1997) |
| Oriental ulcer | The lesion occurring in cutaneous leishmaniasis. Synonym: Oriental sore. (05 Mar 2000) |
| orientation | <psychology> Awareness of one's environment, with reference to person, time and place. (18 Nov 1997) |
| orientation chamber | <cell culture> Chamber designed by Zigmond in which to test the ability of cells (neutrophils) to orient in a gradient of chemoattractant. The chamber is similar to a haemocytometer, but with a depth of only ca. 20m. The gradient is set up by diffusion from one well to the other and the orientation of cells towards the well containing chemoattractant is scored on the basis of their morphology or by filming their movement. (18 Nov 1997) |
| orienting reflex | An aspect of attending in which an organism's initial response to a change or to a novel stimulus is such that the organism becomes more sensitive to the stimulation; e.g., dilation of the pupil of the eye in response to dim light. Synonym: investigatory reflex, orienting response. (05 Mar 2000) |
| orienting response | An aspect of attending in which an organism's initial response to a change or to a novel stimulus is such that the organism becomes more sensitive to the stimulation; e.g., dilation of the pupil of the eye in response to dim light. Synonym: investigatory reflex, orienting response. (05 Mar 2000) |
| orientomycin | <drug> A broad-spectrum antibiotic synthesised by the bacterium Streptomyces orchidaceus which is used most often to treat urinary tract infections and tuberculosis.This antibiotic is a structural analogue of the amino acid D-alanine and it inhibits bacteria's ability to make peptidoglycan, an important component of the bacterial cell wall. (09 Oct 1997) |
| orifice | An opening. The mouth for example is an orifice. (12 Dec 1998) |