| yellow fever virus | <virology> A togavirus (Class IV) with an RNA genome responsible for the disease of the name whose symptoms include fever and haemorrhage. Transmitted by the mosquitoes Aedes aegypti and Haemagogus. Only one antigenic type of the virus known and causes fatal hepatitis in many primates, including humans. This virus is endemic to areas of Africa, South America and the Carribean and has been a major epidemic threat. (11 May 1997) |
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| yellow fibres | Fibre's that are 0.2 to 2 um in diameter but may be larger in some ligaments; they branch and anastomose to form networks and fuse to form fenestrated membranes; the fibre's and membranes consist of microfibrils about 10 nm wide and an amorphous substance containing elastin. Synonym: yellow fibres. (05 Mar 2000) |
| yellow-golds | <botany> A certain plant, probably the yellow oxeye. Source: Websters Dictionary (01 Mar 1998) |
| yellow hepatisation | The final stage of hepatisation in which the exudate is becoming purulent. (05 Mar 2000) |
| yellow jacket stings | Stings from yellow jackets and other large stinging insects such as bees, hornets and wasps can trigger allergic reactions of varying severity. Avoidance and prompt treatment are essential. In selected cases, allergy injection therapy is highly effective. (the three a's of insect allergy are adrenaline, avoidance and allergist.) (12 Dec 1998) |
| yellow ligament | One of a series of bands of yellow (latin flavum) elastic tissue attached to and extending between the ventral portions of the laminae of two adjacent vertebrae, from the junction of the axis and the third cervical vertebra to the junction of the fifth lumbar vertebra and the sacrum. They assist in maintaining or regaining the erect position and serve to close in the spaces between the arches. (12 Dec 1998) |
| yellow mercury iodide | HgI;used externally as an ointment in eye diseases. Synonym: mercury protoiodide, yellow mercury iodide. (05 Mar 2000) |
| yellow nail | The complete or almost complete cessation of all nail growth, with thickening of the nails, increase in the convexity, loss of cuticles, and yellowing; the resulting onycholysis can cause loss of some of the nails; the condition is often associated with pulmonary disease but differs from clubbing in that the soft tissues are not hypertrophic. Synonym: yellow nail syndrome. (05 Mar 2000) |
| yellow nail syndrome | The complete or almost complete cessation of all nail growth, with thickening of the nails, increase in the convexity, loss of cuticles, and yellowing; the resulting onycholysis can cause loss of some of the nails; the condition is often associated with pulmonary disease but differs from clubbing in that the soft tissues are not hypertrophic. Synonym: yellow nail syndrome. (05 Mar 2000) |
| yellow precipitate | mercuric oxide, yellow |
| yellow root | <botany> Any one of several plants with yellow roots. Specifically: See Xanthorhiza. Same as Orangeroot. Source: Websters Dictionary (01 Mar 1998) Previous: yellow mercury iodide, yellow nail, yellow nail syndrome, yellow precipitateNext: yellow root, yellows, yellowseed, yellowshins, yellow skinyellow root hydrastis |
| yellow skin | The occurrence of patches of yellow colour in the skin, resembling xanthoma, but without the nodules or plates. Synonym: cholesteroderma, xanthochroia, xanthoderma, xanthopathy, yellow disease, yellow skin. Origin: xantho-+ G. Chroma, colour (05 Mar 2000) |
| yellow soft paraffin | <pharmacology> A semisolid unctuous substance, neutral, and without taste or odour, derived from petroleum by distilling off the lighter portions and purifying the residue. It is a yellowish, fatlike mass, transparent in thin layers, and somewhat fluorescent. It is used as a bland protective dressing, and as a substitute for fatty materials in ointments. Petrolatum is the official name for the purified product. Cosmoline and vaseline are commercial names for substances essentially the same, but differing slightly in appearance and consistency or fusibility. Source: Websters Dictionary (01 Mar 1998) |
| yellow spot | An oval area of the sensory retina, 3 by 5 mm, temporal to the optic disk corresponding to the posterior pole of the eye; at its centre is the central fovea, which contains only retinal cones. Synonym: area centralis, macula lutea, macular area, punctum luteum, Soemmerring's spot, yellow spot. (05 Mar 2000) |
| yellow vision | <ophthalmology> A form of chromatopsia in which objects looked at appear yellow. Origin: Gr. Opsis = vision (11 May 1997) |