| anaemic halo | Pale, relatively avascular areas in the skin seen around vascular spiders, cherry angiomas, and sometimes in acute macular eruptions. (05 Mar 2000) |
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| anaemic | Pertaining to or manifesting the various features of anaemia. (05 Mar 2000) |
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| anaemic anoxia | A term formerly considered synonymous with anaemic hypoxia, but now reserved for extremely severe cases in which oxygen is almost completely lacking. (05 Mar 2000) |
| anaemic hypoxia | Hypoxia resulting from a decreased concentration of functional haemoglobin or a reduced number of erythrocytes; it is caused by haemorrhage or anaemia of various types, or by poisoning with CO2, nitrites, or chlorates. (05 Mar 2000) |
| anaemic infarct | An infarct in which little or no bleeding into tissue spaces occurs when the blood supply is obstructed. Synonym: pale infarct, white infarct. (05 Mar 2000) |
| anaemic murmur | A nonvalvular murmur heard on auscultation of the heart and large blood vessels in cases of profound anaemia associated mainly with turbulent blood flow due to decreased blood viscosity. (05 Mar 2000) |
| glaucomatous halo | A yellowish white ring surrounding the optic disk, indicating atrophy of the choroid in glaucoma. Synonym: glaucomatous ring. A halo surrounding lights, caused by corneal oedema in glaucoma. Synonym: rainbow symptom. (05 Mar 2000) |
| halo | <radiobiology> The cold, dense plasma formed outside the last closed flux surface during a vertical displacement event. The large currents which flow through this plasma stop the displacement and transfer the force to the vacuum vessel. If care is not taken in design, the halo currents can be large enough to threaten the structural integrity of the vacuum vessel or in-vessel components. Whereas the centre of a tokamak plasma is too hot for material probes to survive, probes (such as magnetic-field coils) can sometimes be placed in the halo, and can measure things such as the halo current. See: vertical instability. (09 Oct 1997) |
| halo blight | Halo blight is a fatal plant disease which attacks legumes and is caused by the bacteria Pseumonas phaseolicola. The plant develops yellow-ringed, water-soaked spots, then withers and dies without rotting. (09 Oct 1997) |
| halo cast | A cast applied to the shoulders in which metal bars are set that extend over the head to a halo, from which traction may be applied to the head by means of tongs or a halter. (05 Mar 2000) |
| halo current | <radiobiology> Currents in the halo region of a plasma discharge. See: halo. (09 Oct 1997) |
| halo effect | The effect (usually beneficial) that the manner, attention, and caring of a provider have on a patient during a medical encounter, regardless of what medical procedure or services the encounter involves, the influence upon an observation of the observer's perception of the characteristics of the individual observed (other than the characteristics under study) or the influence of the observer's recollection or knowledge of findings on a previous occasion. (05 Mar 2000) |
| halo melanoma | <tumour> A rare condition in which a melanoma is surrounded by an irregular area of depigmentation. (05 Mar 2000) |
| halo nevus | A benign, sometimes multiple, melanocytic nevus in which involution occurs with a central brown mole surrounded by a uniformly depigmented zone or halo. Synonym: leukoderma acquisitum centrifugum, Sutton's disease, Sutton's nevus. (05 Mar 2000) |
| halo sign | <radiology> Narrow, radiolucent ring surrounding breast lesion, indicates benign tumour, rare exceptions: intracystic carcinoma, papillary carcinoma, carcinoma arising in fibroadenoma (12 Dec 1998) |
| halo sign of hydrops | A discredited roentgenographic sign of foetal hydrops caused by scalp oedema so that a definite corona surrounds the skull. (05 Mar 2000) |