| RH | radiant heat; radiation hybrid; radiological health; reactive hyperemia; recurrent herpes; regulator... |
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| RPE | rate of perceived exertion; recurrent pulmonary embolism; retinal pigment epithelium; ribulose 5-pho... |
| RR | radiation reaction; radiation response; rate ratio; rational recovery [group]; recovery room; relati... |
| ACO | acute coronary occlusion; alert, cooperative, and oriented; anodal closure odor |
| BAVFO | bradycardia after arteriovenous fistula occlusion |
| central artery of retina | A branch of the ophthalmic artery which penetrates the optic nerve 1 cm behind the eye to enter the eye at the optic papilla in the retina; it divides into superior and inferior temporal and nasal branches. Synonym: arteria centralis retinae, arteria retinae centralis, Zinn's artery. (05 Mar 2000) |
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| central atom | <physics> The atom to which the other atoms are bonded in a small molecule. (09 Oct 1997) |
| central bearing | In dentistry, application of forces between the maxillae and mandible at a single point located as near as possible to the centre of the supporting areas of the upper and lower jaws; used for the purpose of distributing closing forces evenly throughout the areas of the supporting structures during the recording of maxillomandibular (jaw) relations and during the correction of occlusal errors. (05 Mar 2000) |
| central-bearing device | In dentistry, a device which provides a central point of bearing, or support, between upper and lower record bases; it consists of a contacting point which is attached to one base and a plate attached to the other which provides the surface on which the bearing point rests or moves. (05 Mar 2000) |
| central-bearing point | The contact point of a central-bearing device. (05 Mar 2000) |
| central-bearing tracing device | In dentistry, a central-bearing device used for making a tracing and/or for support between upper and lower bases. (05 Mar 2000) |
| central body | A zone of cytoplasm containing one or two centrioles but devoid of other organelles; usually located near the nucleus of a cell. Synonym: cell centre, central body, centrosome, cinocentrum, kinocentrum, microcentrum. Origin: cyto-+ G. Kentron, centre (05 Mar 2000) |
| central bone | A small bone occasionally found at the dorsal aspect of the wrist between the scaphoid, capitate, and trapezoid; it is developed as an independent cartilage in early foetal life but usually becomes fused with the scaphoid; it occurs normally in most monkeys. Synonym: central bone. (05 Mar 2000) |
| central bone of ankle | A bone of the tarsus on the medial side of the foot articulating with the head of the talus, the three cuneiform bones, and occasionally the cuboid. Synonym: os naviculare, central bone of ankle, os centrale tarsi. (05 Mar 2000) |
| central bradycardia | Bradycardia due to disease of the central nervous system, usually with increased intracranial pressure. (05 Mar 2000) |
| central callus | The callus within the medullary cavity of a fractured bone. Synonym: medullary callus. (05 Mar 2000) |
| central canal | The ependyma-lined lumen (cavity) of the neural tube, the cerebral part of which remains patent to form the ventricles of the brain, while the spinal part in the adult often is reduced to a solid strand of modified ependyma. Synonym: canalis centralis medullae spinalis, central canal of spinal cord, tubus medullaris. Synonym: syringocele. (05 Mar 2000) |
| central canal of spinal cord | The ependyma-lined lumen (cavity) of the neural tube, the cerebral part of which remains patent to form the ventricles of the brain, while the spinal part in the adult often is reduced to a solid strand of modified ependyma. Synonym: canalis centralis medullae spinalis, central canal of spinal cord, tubus medullaris. Synonym: syringocele. (05 Mar 2000) |
| central canal of the vitreous | A minute canal running through the vitreous from the discus nervi optici to the lens, containing in foetal life a prolongation of the central artery of the retina, the hyaloid artery. See: vitreous, hyaloid artery. Synonym: canalis hyaloideus, central canal of the vitreous, Cloquet's canal, Stilling's canal. (05 Mar 2000) |
| central canals of cochlea | Centrally placed channels that convey vessels and nerves to the apical turns of the cochlea. Synonym: canales longitudinales modioli, central canals of cochlea. (05 Mar 2000) |