| Jackson's veil | A thin vascular membrane or veil-like adhesion, covering the anterior surface of the ascending colon from the caecum to the right flexure; it may cause obstruction by kinking of the bowel. Synonym: Jackson's veil. (05 Mar 2000) |
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| Jackson, Jabez | <person> U.S. Surgeon, 1868-1935. See: Jackson's membrane, Jackson's veil. (05 Mar 2000) |
| Jackson, John Hughlings | <person> English neurologist, 1835-1911. See: jacksonian epilepsy, Jackson's law, Jackson's rule, Jackson's sign. (05 Mar 2000) |
| jacksonian | Described by John Hughlings Jackson. See: jacksonian epilepsy, Jacksonian seizure. (05 Mar 2000) |
| jacksonian epilepsy | A brief temporary alteration in movement, sensation or autonomic nerve function caused by abnormal electrical activity in a localised area of the brain. Focal seizures (i.e. Partial or Jacksonian seizures) usually cause no change in awareness or alertness. An example of a focal (partial) seizure would be rhythmic muscle contractions in one area of the body: lip smacking, mouth movements, drooling, head turning, eye movements or seemingly purposeful movements (for example picking at clothes). Other presentations may be strictly sensory with abnormal numbness, tingling or a crawling sensation to the skin. More unusual symptoms include changes in speech, thought, personality, mood, sensation of deja vu or hallucinations. (27 Sep 1997) |
| Jacksonian seizure | A brief temporary alteration in movement, sensation or autonomic nerve function caused by abnormal electrical activity in a localised area of the brain. Focal seizures (i.e. Partial or Jacksonian seizures) usually cause no change in awareness or alertness. An example of a focal (partial) seizure would be rhythmic muscle contractions in one area of the body: lip smacking, mouth movements, drooling, head turning, eye movements or seemingly purposeful movements (for example picking at clothes). Other presentations may be strictly sensory with abnormal numbness, tingling or a crawling sensation to the skin. More unusual symptoms include changes in speech, thought, personality, mood, sensation of deja vu or hallucinations. (27 Sep 1997) |
| jackstone bladder calculus | <radiology> Spiculated calculus in urinary bladder, calcium oxalate monohydrate (12 Dec 1998) |
| jackstraw | 1. An effigy stuffed with straw; a scarecrow; hence, a man without property or influence. 2. One of a set of straws of strips of ivory, bone, wood, etc, for playing a child's game, the jackstraws being thrown confusedly together on a table, to be gathered up singly by a hooked instrument, without touching or disturbing the rest of the pile. See Spilikin. Source: Websters Dictionary (01 Mar 1998) |
| jackwood | Wood of the jack (Artocarpus integrifolia), used in cabinetwork. Source: Websters Dictionary (01 Mar 1998) |
| jacobaean lily | <botany> A bulbous plant (Amaryllis, or Sprekelia, formosissima) from Mexico. It bears a single, large, deep, red, lilylike flower. Alternative forms: Jacobean. See: Jacobean. Source: Websters Dictionary (01 Mar 1998) |
| Jacobaeus operation | An obsolete term for pleurolysis. (05 Mar 2000) |
| Jacobaeus, Hans | <person> Swedish surgeon, 1879-1937. See: Jacobaeus operation. (05 Mar 2000) |
| jacobin | 1. A Dominican friar; so named because, before the French Revolution, that order had a convent in the Rue St. Jacques, Paris. 2. One of a society of violent agitators in France, during the revolution of 1789, who held secret meetings in the Jacobin convent in the Rue St. Jacques, Paris, and concerted measures to control the proceedings of the National Assembly. Hence: A plotter against an existing government; a turbulent demagogue. 3. <zoology> A fancy pigeon, in which the feathers of the neck form a hood, whence the name. The wings and tail are long, and the beak moderately short. Origin: F. See Jack, Jacobite. Source: Websters Dictionary (01 Mar 1998) |
| jacobite | 1. A partisan or adherent of James the Second, after his abdication, or of his descendants, an opposer of the revolution in 1688 in favor of William and Mary. 2. One of the sect of Syrian Monophysites. The sect is named after Jacob Baradaeus, its leader in the sixth century. Origin: L. Jacobus James: cf. F. Jacobite. See Jack. Source: Websters Dictionary (01 Mar 1998) |
| Jacobson's anastomosis | A portion of the tympanic plexus. (05 Mar 2000) |