| clavus | 1. A small conical callosity caused by pressure over a bony prominence, usually on a toe. Synonym: corn, heloma. 2. Obsolete term for a condition resulting from healing of a granuloma of the foot in yaws, in which a core falls out, leaving an erosion. Origin: L. A nail, wart, corn (05 Mar 2000) |
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| clavus hystericus | Severe head pain, sharply defined, and typically described as feeling like a nail being driven into the head; usually regarded as a conversion symptom. Origin: L. Clavus, nail (05 Mar 2000) |
| claw | <plant biology> A narrow, stalk-like basal portion of a petal, sepal or bract. (12 Jan 1998) |
| clawfoot | A condition of the foot characterised by hyperextension at the metatarsophalangeal joint and flexion at the interphalangeal joints, as a fixed contracture. (05 Mar 2000) |
| clawhand | Atrophy of the interosseous muscles of the hand with hyperextension of the metacarpophalangeal joints and flexion of the interphalangeal joints. Synonym: main en griffe. (05 Mar 2000) |
| clay | <ecology> Particles in siliciclastic sediment that are smaller than 0.0039 millimetres in size, according to the Udden-Wentworth scale. Clay and silt are collectively classified as mud. A collective term for a large group of minerals that are found in great abundance in extremely fine-grained sediments or sedimentary rocks (i.e. Shales). (09 Oct 1997) |
| clay pigeon poisoning | A highly fatal disease of swine, usually caused by the ingestion of fragments of the clay pigeons used as targets by shooting clubs; some cases have been caused by consumption of other bituminous substances, such as road tar and tar paper. Synonym: clay pigeon poisoning. (05 Mar 2000) |
| clay shoveler's fracture | <radiology> Avulsion fracture of spinous process of C7 or T1, sudden load on a flexed spine, may occur secondary to rotational injury see: cervical spine fractures (12 Dec 1998) |
| Claybrook's sign | <clinical sign> In rupture of abdominal viscus, transmission of breath and heart sounds through the abdominal wall. (05 Mar 2000) |
| Claybrook, Edwin | <person> U.S. Surgeon, 1871-1931. See: Claybrook's sign. (05 Mar 2000) |