| chemical | 1. <chemistry> Of or pertaining to, chemistry. 2. A substance composed of chemical elements or obtained by chemical processes. (21 May 1997) |
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| chemical and pharmacologic phenomena | Chemical, pharmacologic, and metabolic action and interaction of drugs. (12 Dec 1998) |
| chemical antidote | A substance that unites with a poison to form an innocuous chemical compound. (05 Mar 2000) |
| chemical attraction | The force impelling atoms of different elements or molecules to unite to form new substances or compounds. (05 Mar 2000) |
| chemical bond | The link between two atoms within a molecule. Different types of chemical bonds include hydrogen bonds, covalent bonds, and ionic bonds. (09 Oct 1997) |
| chemical burn | A burn due to a caustic chemical. (05 Mar 2000) |
| chemical cautery | Any substance that destroys tissue upon application. Synonym: chemical cautery, chemicocautery. (05 Mar 2000) |
| chemical ceptor | Ceptor that initiates chemical reactions in response to the appropriate stimuli. (05 Mar 2000) |
| chemical change | A process in which one or more substances are changed into one or more different substances. (09 Oct 1997) |
| chemical complexity | The level measured, via a chemical assay, of a DNA component. (05 Mar 2000) |
| chemical conjunctivitis | Conjunctival inflammation due to chemical irritants. (05 Mar 2000) |
| chemical dermatitis | Allergic contact dermatitis or primary irritation dermatitis due to application of chemicals; usually characterised by erythema, oedema, and vesiculation of the exposed or contacted site. (05 Mar 2000) |
| chemical diabetes | A mild form of diabetes mellitus in which the patient displays no overt symptoms, but displays certain abnormal responses to diagnostic procedures, such as an elevated fasting blood glucose concentration or reduced glucose tolerance. Synonym: chemical diabetes. (05 Mar 2000) |
| chemical energy | Energy liberated or absorbed by a chemical reaction, e.g., oxidation of carbon, or absorbed in the formation of a chemical compound. (05 Mar 2000) |
| chemical equation | A representation of a chemical reaction in which chemical symbols represent reactants on the left side and products on the right side. (09 Oct 1997) |
| acute chemical pneumonitis | <chest medicine> Inflammation of the lungs which occurs secondary to exposure to a chemical, organic dust, fungus or mould. Chronic exposure can lead to chronic lung changes evident on chest X-ray. Symptoms include cough, fever, shortness of breath and wheezing. See: bird-handler's disease. (27 Sep 1997) |
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| mechanico-chemical | Pertaining to, connected with, or dependent upon, both mechanics and chemistry; said especially of those sciences which treat of such phenomena as seem to depend on the laws both of mechanics and chemistry, as electricity and magnetism. Source: Websters Dictionary (01 Mar 1998) |
| riot control agents, chemical | Chemical substances which are employed during a riot in order to control or disperse the rioting parties. (12 Dec 1998) |
| micro-chemical | Of or pertaining to microchemistry; as, a micro-chemical test. Source: Websters Dictionary (01 Mar 1998) |
| models, chemical | Theoretical representations that simulate the behaviour or activity of chemical processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment. (12 Dec 1998) |
| water pollutants, chemical | Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water. (12 Dec 1998) |
| commodity chemical | <chemistry> Chemicals such as ethanol that have low monetary value and are thus sold primarily in bulk. (09 Oct 1997) |
| multiple chemical sensitivity | An acquired disorder characterised by recurrent symptoms, referable to multiple organ systems, occurring in response to demonstrable exposure to many chemically unrelated compounds at doses far below those established in the general population to cause harmful effects. No single widely accepted test of physiologic function can be shown to correlate with symptoms. (cullen mr. The worker with multiple chemical sensitivities: an overview. Occup med 1987;2(4):655-61) (12 Dec 1998) |
| hypophysectomy, chemical | Total or subtotal destruction of the pituitary gland by chemical injection. It is usually achieved by injection of ethyl alcohol via trans-sphenoidal cannulation under stereotaxic control. It is usually performed for the treatment of intractable pain. (12 Dec 1998) |
| defoliants, chemical | Herbicides that remove leaves from trees and growing plants. They may be either organic or inorganic. Several of the more persistent types have been used in military operations and many are toxic. (12 Dec 1998) |
| sympathectomy, chemical | Sympathectomy using chemicals (e.g., 6-hydroxydopamine or guanethidine) which selectively and reversibly destroy adrenergic nerve endings while leaving cholinergic nerve endings intact. (12 Dec 1998) |
| evolution, chemical | Chemical and physical transformation of the biogenic elements from their nucleosynthesis in stars to their incorporation and subsequent modification in planetary bodies and terrestrial biochemistry. It includes the mechanism of incorporation of biogenic elements into complex molecules and molecular systems, leading up to the origin of life. (12 Dec 1998) |