| FAP | familial adenomatous polyposis; familial amyloid polyneuropathy; fatty acid polyunsaturated; fatty a... |
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| GnRH | Gonadotropin Releasing Hormone [HP 1898, 2034] = LHRH = Go... |
| CAA | carotid audiofrequency analysis; cerebral amyloid angiopathy; circulating anodic antigen; Clean Air ... |
| poly-IC, | poly-I:C copolymer of polyinosinic and polycytidylic acids; synthetic RNA polymer |
| TAGH | triiodothyronine, amino acids, glucagon, and heparin |
| essential | 1. Belonging to the essence, or that which makes an object, or class of objects, what it is. "Majestic as the voice sometimes became, there was forever in it an essential character of plaintiveness." (Hawthorne) 2. Hence, really existing; existent. "Is it true, that thou art but a a name, And no essential thing?" (Webster (1623)) 3. Important in the highest degree; indispensable to the attainment of an object; indispensably necessary. "Judgment's more essential to a general Than courage." (Denham) "How to live? that is the essential question for us." (H. Spencer) 4. Containing the essence or characteristic portion of a substance, as of a plant; highly rectified; pure; hence, unmixed; as, an essential oil. "Mine own essential horror." 5. Necessary; indispensable; said of those tones which constitute a chord, in distinction from ornamental or passing tones. 6. <medicine> Idiopathic; independent of other diseases. <biology> Essential character, a class of volatile oils, extracted from plants, fruits, or flowers, having each its characteristic odour, and hot burning taste. They are used in essences, perfumery, etc, and include many varieties of compounds; as lemon oil is a terpene, oil of bitter almonds an aldehyde, oil of wintergreen an ethereal salt, etc.; called also volatile oils in distinction from the fixed or nonvolatile. Origin: Cf. F. Essentiel. See Essence. Source: Websters Dictionary (01 Mar 1998) |
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| essential albuminuria | A collective term for types that are not the result of pathologic changes in the kidneys. Synonym: essential albuminuria. (05 Mar 2000) |
| essential amino acid | <biochemistry> Those amino acids that cannot be synthesised by an organism and must therefore be present in the diet. The term is often applied anthropocentrically to those amino acids required by humans (Ileu, Leu, Lys, Met, Phe, Thr, Try, & Val), though rats need two more (Arg & His). (18 Nov 1997) |
| essential anaemia | An obsolete term for pernicious anaemia; also used formerly for any type of anaemia of unknown mechanism. (05 Mar 2000) |
| essential anisocoria | A common (20% of normals) benign inequality of the pupils that may change from one hour to the next. Synonym: essential anisocoria, physiologic anisocoria, simple-central anisocoria. (05 Mar 2000) |
| essential bradycardia | A slow pulse for which no cause can be discovered. Synonym: idiopathic bradycardia. (05 Mar 2000) |
| essential dysmenorrhoea | <gynaecology> Painful menses due to a functional disturbance and not due to organic factors such as growths, inflammation or anatomy. (27 Sep 1997) |
| essential fever | Fever without known infectious disease. (05 Mar 2000) |
| essential food factors | Those substances required in the diet: certain amino acids and unsaturated fatty acids, vitamins, essential minerals, etc. (05 Mar 2000) |
| essential gene | <genetics> Any gene that, if it does not workcorrectly, kills the organism. (09 Oct 1997) |
| essential hypertension | Hypertension without known cause. Synonym: idiopathic hypertension, primary hypertension. (05 Mar 2000) |
| essential oils | Plant products, usually somewhat volatile, giving the odours and tastes characteristic of the particular plant, thus possessing the essence, e.g., citral, pinene, camphor, menthane, terpenes; usually, the steam distillates of plants or oils of plants obtained by pressing out the rinds of a particular plant. See: volatile oil. (05 Mar 2000) |
| essential phthisis bulbi | A softening of the eyeball (ophthalmomalacia) and reduction in size, not due to inflammation. (05 Mar 2000) |
| essential progressive atrophy of iris | Progressive atrophy of the iris without inflammatory signs, characterised by patchy loss of all layers of the iris with hole formation, migration of the pupil, degeneration of the corneal endothelium, peripheral anterior synechiae, and secondary glaucoma; usually unilateral, predominantly affecting women in their middle years. (05 Mar 2000) |
| essential pruritus | Itching that occurs independently of skin lesions. (05 Mar 2000) |