| polyarteritis nodosa | <radiology> Necrotizing vasculitis of medium-sized arteries, usually in male adults, associated with hepatitis B antigen, kidney: most frquently involved organ (85%), multiple small intrarenal aneurysms, aneurysms may disappear (thrombosis) or appear in new locations, arterial narrowing and thrombosis (chronic/healing stage), multiple small cortical infarcts, associated with hypertension and renal failure, chest involvement (70%), cardiomegaly/pericardial effusion (14%), wedge shaped/round peripheral infiltrates simulating PE (14%), interstitial lower lung field pneumonitis, also may involve liver (66%), mesenteric vessels (50%), skeletal muscle (39%), skin (20%) (12 Dec 1998) |
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| polyarthric | Relating to or involving many joints. Synonym: polyarthric, polyarticular. Origin: multi-+ L. Articulus, joint (05 Mar 2000) |
| polyarthritis | <pathology> An inflammation of several joints together. Origin: Gr. Arthron = joint (18 Nov 1997) |
| polyarthritis chronica | An obsolete term for rheumatoid arthritis. (05 Mar 2000) |
| polyarthritis chronica villosa | A chronic inflammation confined to the synovial membrane, involving a number of joints; it occurs in women at the menopause and in children. (05 Mar 2000) |
| polyarthritis rheumatica acuta | An obsolete term for polyarthritis associated with rheumatic fever. (05 Mar 2000) |
| polyarticular | Involving many joints. As opposed to monoarticular (affecting just one joint). From the latin articulus, meaning a joint. (12 Dec 1998) |
| polyatomic | <chemistry> Having more than one atom in the molecule; consisting of several atoms. Having a valence greater than one. Origin: Poly- + atomic. Source: Websters Dictionary (01 Mar 1998) |
| polyautography | The act or practice of multiplying copies of one's own handwriting, or of manuscripts, by printing from stone, a species of lithography. Origin: Poly- + autography. Source: Websters Dictionary (01 Mar 1998) |
| polyauxotroph | A mutant organism that requires several nutrients that are not required by the wild type organism. Compare: auxotroph, monoauxotroph. (05 Mar 2000) |
| polyavitaminosis | Avitaminosis with multiple deficiencies. (05 Mar 2000) |
| polyaxial joint | One in which movement occurs in a number of axes. See: ball-and-socket joint. Synonym: polyaxial joint. (05 Mar 2000) |
| polybasic | <chemistry> Capable of neutralising, or of combining with, several molecules of a monacid base; having several hydrogen atoms capable of being replaced by basic radicals; said of certain acids; as, sulphuric acid is polybasic. Origin: Poly- + basic. Source: Websters Dictionary (01 Mar 1998) |
| polybasic acid | An acid containing more than three ionizable atoms of hydrogen in the molecule. (05 Mar 2000) |
| polybasite | <chemical> An iron-black ore of silver, consisting of silver, sulphur, and antimony, with some copper and arsenic. See: Polybasic. Source: Websters Dictionary (01 Mar 1998) |