| park | 1. A piece of ground inclosed, and stored with beasts of the chase, which a man may have by prescription, or the king's grant. 2. A tract of ground kept in its natural state, about or adjacent to a residence, as for the preservation of game, for walking, riding, or the like. "While in the park I sing, the listening deer Attend my passion, and forget to fear." (Waller) 3. A piece of ground, in or near a city or town, inclosed and kept for ornament and recreation; as, Hyde Park in London; Central Park in new York. 4. A space occupied by the animals, wagons, pontoons, and materials of all kinds, as ammunition, ordnance stores, hospital stores, provisions, etc, when brought together; also, the objects themselves; as, a park of wagons; a park of artillery. 5. A partially inclosed basin in which oysters are grown. Alternative forms: parc] Park of artillery. See Artillery. Park phaeton, a small, low carriage, for use in parks. Origin: AS. Pearroc, or perh. Rather fr. F. Parc; both being of the same origin; cf. LL. Parcus, parricus, Ir. & Gael. Pairc, W. Park, parwg. Cf. Paddock an inclosure, Parrock. Source: Websters Dictionary (01 Mar 1998) |
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| Park's aneurysm | An arteriovenous aneurysm in which the brachial artery communicates with the brachial and median basilic veins. (05 Mar 2000) |
| Park, Henry | <person> British surgeon, 1744-1831. See: Park's aneurysm. (05 Mar 2000) |
| Park, William | <person> U.S. Bacteriologist, 1863-1939. See: Park-Williams bacillus, Park-Williams fixative. (05 Mar 2000) |
| Park-Williams bacillus | A special strain of Corynebacterium diphtheriae used for toxin production. (05 Mar 2000) |
| Park-Williams fixative | A fixative for spirochetes, comprised of a 2% solution of osmic acid to the fumes of which the bacteria are exposed for a few seconds. (05 Mar 2000) |
| Parker, Edward Mason | <person> U.S. Surgeon, 1860-1941. See: Parker-Kerr suture. (05 Mar 2000) |
| Parker-Kerr suture | A continuous inverting suture used to close an open end of intestine. (05 Mar 2000) |
| parkeria | <zoology> A genus of large arenaceous fossil Foraminifera found in the Cretaceous rocks. The species are globular, or nearly so, and are of all sizes up to that of a tennis ball. Origin: NL. So named from W. K. Parker, a British zoologist. Source: Websters Dictionary (01 Mar 1998) |
| parking facilities | Indoor or outdoor areas designated for the parking of vehicles. (12 Dec 1998) |
| parkinson disease | Progressive, degenerative disease of unknown aetiology characterised by rhythmic tremor of the limbs, stooped posture, slowness of voluntary movements, and masklike facial expression. Pathologically there is nerve cell loss in the melanin-containing cells in the brainstem and a corresponding reduction in dopamine levels in the corpus striatum. Lewy bodies are present in the substantia nigra and locus coeruleus. (12 Dec 1998) |
| parkinson disease, postencephalitic | A form of parkinson disease due to degeneration of the corpus striatum or substantia nigra, frequently occurring as a sequel of lethargic encephalitis. The early age of onset, the rapid progression of symptoms and signs of stabilization, and the presence of a variety of other neurological disorders (sociopathic behaviour, tics, spasms, oculogyric crises and other restricted motor disorders, breathing arrhythmias, hyperphagia, and bizarre movements, postures, and gaits) distinguish this disease from the one described by parkinson. (12 Dec 1998) |
| parkinson disease, symptomatic | Symptoms of parkinson disease induced by drugs, or following cerebral arteriosclerosis, brain tumour, or other central nervous system disorders except encephalitis, which is parkinson disease, postencephalitic. (12 Dec 1998) |
| Parkinson's disease | <neurology> A progressive, neurological disease first described in 1817 by James Parkinson. The pathology is not completely understood, but there appears to be consistent changes in the melanin-containing nerve cells in the brainstem (substantia nigra, locus coeruleus), where there are varying degrees of nerve cell loss with reactive gliosis along with eosinophilic intracytoplasmic inclusions (Lewy bodies). Biochemical studies have shown below normal levels of dopamine in the caudate nucleus and putamen. Symptoms include shuffling gait, stooped posture, resting tremor, speech impediments, movement difficulties and an eventual slowing of mental processes and dementia. (27 Sep 1997) |
| Parkinson's facies | The expressionless or masklike facies characteristic of parkinsonism. Synonym: masklike face. (05 Mar 2000) |