| white spot | Gray-white or white, rounded or irregularly shaped, slightly opaque patches or spots that are sometimes observed postmortem in the epicardium, especially in middle-aged or older persons; they result from fibrous thickening, and sometimes hyalinization, of the epicardium; similar lesions may also occur in the visceral layer of the peritoneum. Synonym: macula lactea, macula tendinea, tache blanche, tache laiteuse, tendinous spot, white spot. (05 Mar 2000) |
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| white spot disease | Small discrete, white, waxy, indurated lesions due to localised degenerative changes in the fibrous tissue. Synonym: white spot disease. (05 Mar 2000) |
| white substance | <anatomy> Brain tissue composed of myelin-coated nerve cell fibres. White matter carries information between the nerve cells in the brain and spinal cord. The inner portion of the cerebrum is composed of white matter. See: grey matter. (13 Nov 1997) |
| white thrombus | A thrombus of opaque dull white colour composed essentially of blood platelets. Synonym: pale thrombus. (05 Mar 2000) |
| white turpentine | Turpentine from Pinus palustris. (05 Mar 2000) |
| white-water | <veterinary> A dangerous disease of sheep. Source: Websters Dictionary (01 Mar 1998) |
| white wax | Yellow wax bleached by being rolled very thin and exposed to the light and air, or bleached by chemical oxidants; same uses as yellow wax. Synonym: bleached wax, white beeswax. (05 Mar 2000) |
| white yolk | Yolk consisting of much finer particles than those of yellow yolk; thin layers of it lie between the zones of yellow yolk and form the latebra. (05 Mar 2000) |
| wolff-parkinson-white syndrome | <syndrome> A form of pre-excitation characterised by a short pr interval and a long qrs interval with a delta wave. (12 Dec 1998) |
| Wolf Parkinson White syndrome | <cardiology, syndrome> Abnormal cardiac conduction that occurs by way of an accessory pathway between the atria and the ventricles. Baseline ECG will typically show a short P-R interval and a slurred upstroke of the QRS (delta wave). Tachyarrhythmias are common. (27 Sep 1997) |
| posterior white column of the spinal cord | The large wedge-shaped fibre bundle lying between the posterior gray column and the posterior median septum, and composed largely of dorsal root fibres. Synonym: funiculus posterior, dorsal funiculus, funiculus dorsalis. (05 Mar 2000) |
| Potter, Irving White | <person> U.S. Obstetrician, 1868-1956. See: Potter's version. (05 Mar 2000) |
| schwann's white substance | <anatomy> The substance of the medullary sheath. Source: Websters Dictionary (01 Mar 1998) |
| sclerosis of white matter | <radiology> Type of dysmyelinating disease, hereditary, peripheral nervous system unaffected in some disorders Specific diseases: adrenoleukodystrophy, metachromatic leukodystrophy, spongy degeneration (Canavan), globoid cell (Krabbe) leukodystrophy, Alexander disease, Pelizaeus-Merzbacher disease, Cockayne syndrome (12 Dec 1998) |
| Nicolle's white mycetoma | Mycetoma caused by a species of Aspergillus, and producing relatively large granules, about the size of a pea; infection occurs from barley grain. (05 Mar 2000) |