| polychlorinated biphenyl | Biphenyl in which some or all of the hydrogen atoms attached to ring carbons are replaced by chlorine atoms; a probable human carcingogen and teratogen. (05 Mar 2000) |
|---|---|
| polychlorinated biphenyls | Biphenyl compounds which are extensively chlorinated. Many of these compounds are toxic environmental pollutants. (12 Dec 1998) |
| polychloroterphenyl compounds | Compounds consisting of three benzene rings linked to each other in either ortho, meta or para positions and substituted with chlorine atoms. (12 Dec 1998) |
| polychondritis | A widespread disease of cartilage. Origin: poly-+ G. Chondros, cartilage, + -itis, inflammation (05 Mar 2000) |
| polychondritis, relapsing | An acquired disease of unknown aetiology, chronic course, and tendency to recur. It is characterised by inflammation and degeneration of cartilage and can result in deformities such as floppy ear and saddle nose. Loss of cartilage in the respiratory tract can lead to respiratory obstruction. (12 Dec 1998) |
| polychrest | <medicine> A medicine that serves for many uses, or that cures many diseases. <medicine> Polychrest salt, potassium sulphate, specifically obtained by fusing niter with sulphur. Origin: Gr. Useful for many purposes; many + useful, fr. To use: cf. F. Polychreste. Source: Websters Dictionary (01 Mar 1998) |
| polychroite | <chemistry> The colouring matter of saffron; formerly so called because of the change of colour on treatment with certain acids. Synonym: crocin, and safranin. Origin: Poly- + Gr. Colour: cf. F. Polychroite. Source: Websters Dictionary (01 Mar 1998) |
| polychromaemia | An increase in the total amount of haemoglobin in the blood. (05 Mar 2000) |
| polychromasia | 1. A tendency of certain cells, such as the red blood cells in pernicious anaemia, to stain with basic and also acid dyes. 2. Condition characterised by the presence of many red blood cells that have an affinity for acid, basic, or neutral stains. Synonym: polychromasia, polychromatosis, polychromophilia. (05 Mar 2000) |
| polychromate | <chemistry> A salt of a polychromic acid. See: Polychromic. <chemistry> A compound which exhibits, or from which may be prepared, a variety of colours, as certain solutions derived from vegetables, which display colours by fluorescence. See: Polychromatic. Source: Websters Dictionary (01 Mar 1998) |
| polychromatic | Showing a variety, or a change, of colours. <chemistry> Polychromatic acid, a substance obtained by the action of nitric acid on aloes. Origin: Poly- + chromatic. Source: Websters Dictionary (01 Mar 1998) |
| polychromatic cell | A primitive erythrocyte in bone marrow, with basophilic material as well as haemoglobin (acidophilic) in the cytoplasm. Synonym: polychromatophil cell. (05 Mar 2000) |
| polychromatocyte | polychromatophil |
| polychromatophil cell | A primitive erythrocyte in bone marrow, with basophilic material as well as haemoglobin (acidophilic) in the cytoplasm. Synonym: polychromatophil cell. (05 Mar 2000) |
| polychromatophile | 1. Staining readily with acid, neutral, and basic dyes; denoting certain cells, especially certain red blood cells. Synonym: polychromatophilic. 2. A young or degenerating erythrocyte that manifests acid and basic staining affinities. Synonym: polychromatocyte. Synonym: polychromophil. Origin: poly-+ G. Chroma, colour, + phileo, to love (05 Mar 2000) |