| roach | <zoology> A cockroach. 1. <zoology> A European fresh water fish of the Carp family (Leuciscus rutilus). It is silver-white, with a greenish back. An American chub (Semotilus bullaris); the fallfish. The redfin, or shiner. 2. A convex curve or arch cut in the edge of a sail to prevent chafing, or to secure a better fit. As sound as a roach [roach perhaps being a corruption of a F. Roche a rock], perfectly sound. Origin: OE. Rroche; cf. AS. Reohha, D. Rog, roch, G. Roche, LG. Ruche, Dan. Rokke ray, Sw. Rocka, and E. Ray a fish. Source: Websters Dictionary (01 Mar 1998) |
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| roach-backed | Having a back like that of roach; said of a horse whose back a convex instead of a concave curve. Source: Websters Dictionary (01 Mar 1998) |
| Roach clasp | A clasp whose arms are bar-type extensions from major connectors or from within the denture base; the arms pass adjacent to the soft tissues and approach the point of contact on the tooth in a gingivo-occlusal direction, a clasp consisting of two or more separate arms located opposite to each other on the tooth; the bar arms arise from the framework or from a connector and may traverse the soft tissue; one arm (bar), the retentive arm, usually terminates in the infrabulge (gingival convergence) area of the tooth; the other, the reciprocal arm, usually terminates on the suprabulge (occlusal convergence) area. Synonym: Roach clasp. (05 Mar 2000) |
| Roach, F Ewing | <person> U.S. Prosthodontist, 1868-1960. See: Roach clasp. (05 Mar 2000) |
| medicine, oriental traditional | A system of traditional medicine which is based on the customs, beliefs and practices of the oriental people. (12 Dec 1998) |
| philology, oriental | The study of literature written in languages of asia and the far east, including grammar, etymology, criticism, literary history, and language and linguistic history. (12 Dec 1998) |
| 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) |