| compact bone | The compact, noncancellous portion of bone that consists largely of concentric lamellar osteons and interstitial lamellae. Synonym: substantia compacta, compact substance, substantia compacta ossium. (05 Mar 2000) |
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| compact disks | Computer disks storing data with a maximum reduction of space and bandwidth. The compact size reduces cost of transmission and storage. (12 Dec 1998) |
| compact substance | The compact, noncancellous portion of bone that consists largely of concentric lamellar osteons and interstitial lamellae. Synonym: substantia compacta, compact substance, substantia compacta ossium. (05 Mar 2000) |
| compact torus | <radiobiology> Any of a series of axially symmetric fusion configurations having closed flux surfaces (like a tokamak, not like a mirror machine), but having no material objects piercing the core (as do the toroidal field coils of a tokamak). These devices have an inherently low aspect ratio, approximately unity. The most successful variants are the spheromak and the Field Reversed Configuration. See: low aspect ratio, spheromak, field-reversed configuration. (05 Jan 1998) |
| compacta | The superficial layer of decidual tissue in the pregnant uterus, in which the interglandular tissue preponderates. Synonym: compacta. (05 Mar 2000) |
| compages thoracis | The skeleton of the thorax consisting of the thoracic vertebrae, ribs, costal cartilages, and sternum. Synonym: compages thoracis, skeleton thoracicus. (05 Mar 2000) |
| companion artery to sciatic nerve | <anatomy, nerve> Origin, inferior gluteal; distribution, sciatic nerve; anastomoses, branches of profunda femoris. Synonym: arteria comitans nervi ischiadici, companion artery to sciatic nerve. (05 Mar 2000) |
| companion cell | <plant biology> Relatively small plant cell, with little or no vacuole, found adjacent to a phloem sieve tube and originating with the latter from a common mother cell. Thought to be involved in translocation of sugars in and out of the sieve tube. (05 Jan 1998) |
| companion lymph nodes of accessory nerve | The nodes of the lateral deep cervical group that are located along the accessory nerve; their efferent vessels pass to the supraclavicular lymph nodes. Synonym: companion lymph nodes of accessory nerve, nodi lymphatici comitantes nervi accessorii. (05 Mar 2000) |
| companion vein | A vein accompanying another structure. Synonym: accompanying vein, companion vein. (05 Mar 2000) |
| comparascope | <instrument> A microscope accessory by means of which an observer may directly compare simultaneously the findings in two microscopic preparations. Origin: L. Comparo, to compare, + G. Skopeo, to view (05 Mar 2000) |
| comparative anatomy | The comparative study of animal structure with regard to homologous organs or parts. (05 Mar 2000) |
| comparative medicine | A field of study concentrating on similarities and differences between veterinary medicine and human medicine. (05 Mar 2000) |
| comparative pathology | The pathology of diseases of animals, especially in relation to human pathology. (05 Mar 2000) |
| comparative physiology | The science concerned with the differences in the vital processes in different species of organisms, particularly with a view to the adaptation of the processes to the specific needs of the species, to illuminating the evolutionary relationships among different species, or to establishing other interspecific generalizations and relationships. (05 Mar 2000) |