| PLES | parallel-line equal space |
|---|---|
| RRS | retrorectal space; Richards-Rundle syndrome |
| RSTS | retropharyngeal soft tissue space |
| SES | Society of Eye Surgeons; socioeconomic status; spatial emotional stimulus; sphenoethmoidal suture; s... |
| SM | Master of Science; sadomasochism; self-monitoring; silicon microphysiometer; simple mastectomy; skim... |
| central metal ion | <chemistry> The metal ion to which the ligands are attached at the centre of a coordination complex. (09 Oct 1997) |
|---|---|
| central necrosis | Necrosis involving the deeper or inner portions of a tissue, or an organ or its units. (05 Mar 2000) |
| central nervous system | <anatomy, neurology> Pertaining to the brain, cranial nerves and spinal cord. It does not include muscles or peripheral nerves. In invertebrates, the central nervous system is composed of the segmental ganglia of the ventral nerve cord together with the fused ganglia or brain at the anterior end. Acronym: CNS (12 Jan 1998) |
| central nervous system agents | A class of drugs producing both physiological and psychological effects through a variety of mechanisms. They can be divided into "specific" agents, e.g., affecting an identifiable molecular mechanism unique to target cells bearing receptors for that agent, and "non-specific" agents, those producing effects on different target cells and acting by diverse molecular mechanisms. Those with non-specific mechanisms are generally further classed according to whether they produce behavioural depression or stimulation. Those with specific mechanisms are classed by locus of action or specific therapeutic use. (12 Dec 1998) |
| central nervous system depressants | A very loosely defined group of drugs that tend to reduce the activity of the central nervous system. The major groups included here are ethyl alcohol, anaesthetics, hypnotics and sedatives, narcotics, and tranquillising agents (antipsychotics and antianxiety agents). (12 Dec 1998) |
| central nervous system infections | Diseases of the central nervous sytem collectively, caused by pathogenic organisms. (12 Dec 1998) |
| central nervous system neoplasms | Neoplasms located in the brain, spinal cord, or meninges. (12 Dec 1998) |
| central nervous system stimulants | A loosely defined group of drugs that tend to increase behavioural alertness, agitation, or excitation. They work by a variety of mechanisms, but usually not by direct excitation of neurons. The many drugs that have such actions as side effects to their main therapeutic use are not included here. (12 Dec 1998) |
| central neuritis | Inflammation of the nervous substance proper, the axons, and myelin. Synonym: axial neuritis, central neuritis. (05 Mar 2000) |
| central obesity | The deposition of obesity around the trunk sparing the limbs. (27 Sep 1997) |
| central ossifying fibroma | <tumour> A painless, slow-growing, expansile, sharply circumscribed benign fibro-osseus tumour of the jaws that is derived from cells of the periodontal ligament; presents initially as a radiolucency that becomes progressively more opaque as it matures. See: central cementifying fibroma. (05 Mar 2000) |
| central osteitis | <pathology> Inflammation of bone caused by a pyogenic organism. It may remain localised or may spread through the bone to involve the marrow, cortex, cancellous tissue and periosteum. Origin: Gr. Myelos = marrow (18 Nov 1997) |
| central paralysis | Paralysis due to a lesion in the brain or spinal cord. (05 Mar 2000) |
| central pit | A depression in the centre of the macula retinae containing only cones and lacking blood vessels. Synonym: fovea centralis retinae, central pit. (05 Mar 2000) |
| central placenta previa | Placenta previa in which the placenta entirely covers the internal os of the cervix. Synonym: central placenta previa, total placenta previa. (05 Mar 2000) |