| Jaccoud's arthropathy | A rare form of chronic arthritis, reported to occur after attacks of acute rheumatic fever, characterised by an unusual form of bone erosion of the metacarpal heads and by ulnar deviation of the fingers; it resembles rheumatoid arthritis, but with less overt inflammation, and rheumatoid factor is absent. Synonym: Jaccoud's arthropathy. (05 Mar 2000) |
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| Jaccoud, Francois Sigismond | <person> French physician, 1830-1913. See: Jaccoud's arthritis, Jaccoud's arthropathy. (05 Mar 2000) |
| jack | <marine biology> Young salmon, usually a male, that matures precociously. (12 Jan 1998) |
| jackal | 1. <zoology> Any one of several species of carnivorous animals inhabiting Africa and Asia, related to the dog and wolf. They are cowardly, nocturnal, and gregarious. They feed largely on carrion, and are noted for their piercing and dismal howling. The common species of Southern Asia (Canis aureus) is yellowish gray, varied with brown on the shoulders, haunches, and legs. The common African species (C. Anthus) is darker in colour. 2. One who does mean work for another's advantage, as jackals were once thought to kill game which lions appropriated. Origin: Pers. Shaghal: cf. OF. Jackal, F. Chacal; cf. Skr. Cogala. Source: Websters Dictionary (01 Mar 1998) |
| jackass | 1. The male ass; a donkey. 2. A conceited dolt; a perverse blockhead. Jackass bark See Laughing. Source: Websters Dictionary (01 Mar 1998) |
| jackdaw | <zoology> See Daw. Source: Websters Dictionary (01 Mar 1998) |
| jacket | 1. A short upper garment, extending downward to the hips; a short coat without skirts. 2. An outer covering for anything, especially. A covering of some nonconducting material such as wood or felt, used to prevent radiation of heat, as from a steam boiler, cylinder, pipe, etc. 3. In ordnance, a strengthening band surrounding and reenforcing the tube in which the charge is fired. 4. A garment resembling a waistcoat lined with cork, to serve as a life preserver; called also cork jacket. Blue jacket. See Blue. Steam jacket, a space filled with steam between an inner and an outer cylinder, or between a casing and a receptacle, as a kettle. To dust one's jacket, to give one a beating. Origin: F. Jaquette, dim. Of jaque. See Jack. Source: Websters Dictionary (01 Mar 1998) |
| jacket crown | A hollow crown of acrylic resin, fused porcelain or cast gold, combinations of gold and acrylic or gold and porcelain; it fits over the prepared stump of the natural crown. (05 Mar 2000) |
| jacksaw | <zoology> The merganser. Source: Websters Dictionary (01 Mar 1998) |
| jackscrew | A jack in which a screw is used for lifting, or exerting pressure. See Jack. Source: Websters Dictionary (01 Mar 1998) |
| jacksnipe | <zoology> A small European snipe (Limnocryptes gallinula). Synonym: judcock, jedcock, juddock, jed, and half snipe. A small American sandpiper (Tringa maculata). Synonym: pectoral sandpiper, and grass snipe. Source: Websters Dictionary (01 Mar 1998) |
| Jackson's law | Loss of mental functions due to disease retraces in reverse order its evolutionary development. (05 Mar 2000) |
| Jackson's membrane | 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) |
| Jackson's rule | After an epileptic attack, simple and quasiautomatic functions are less affected and more rapidly recovered than the more complex ones. (05 Mar 2000) |
| Jackson's sign | <clinical sign> During quiet respiration the movement of the paralysed side of the chest may be greater than that of the opposite side, while in forced respiration the paralysed side moves less than the other. Origin: J. H. Jackson (05 Mar 2000) |