| organic chemicals | A broad class of substances containing carbon and its derivatives. Many of these chemicals will frequently contain hydrogen with or without oxygen, nitrogen, sulfur, phosphorus, and other elements. They exist in either carbon chain or carbon ring form. (12 Dec 1998) |
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| organic chemistry | <chemistry> A branch of chemistry that deals specifically with the structures, synthesis and reactions of carbon-containing compounds. (11 Jan 1998) |
| organic compound | <chemistry> A compound containing carbon. (11 Jan 1998) |
| organic contracture | Contracture, usually due to fibrosis within the muscle that persists whether the subject is conscious or unconscious. Synonym: fixed contracture. (05 Mar 2000) |
| organic deafness | Deafness due to a pathologic process or an organic aetiology, as opposed to psychogenic deafness. (05 Mar 2000) |
| organic debris | <ecology> Debris consisting of plant or animal material. (11 Jan 1998) |
| organic delusions | False beliefs experienced in the delirium associated with dementia in conjunction with traumatic injury to the brain, or an organic change in the brain such as in Alzheimer's syndrome, or in cocaine or other drug intoxication. (05 Mar 2000) |
| organic dental cement | A dental cement consisting mainly of synthetic polymers. (05 Mar 2000) |
| organic disease | <disease> A disease process which occurs as the result of a demonstrable anatomic or physiologic abnormality. (27 Sep 1997) |
| organic evolution | Biologic evolution was contrasted with cultural evolution in 1968 by A.G. Motulsky who pointed out that biologic evolution is mediated by genes, shows a slow rate of change, employs random variation (mutations) and selection as agents of change, new variants are often harmful, these new variants are transmitted from parents to offspring, the mode of transmission is simple, complexity is achieved by the rare formation of new genes by chromosome duplication, biologic evolution occurs with all forms of life, and the biology of humans requires cultural evolution. See Cultural evolution. (12 Dec 1998) |
| organic headache | Headache due to intracranial disease. (05 Mar 2000) |
| organic level | The amount of organic matter prescribed to be left after logging. (05 Dec 1998) |
| organic mental disorder | A psychological, cognitive, or behavioural abnormality associated with transient or permanent dysfunction of the brain, usually characterised by the presence of an organic mental syndrome. (05 Mar 2000) |
| organic mental syndrome | <syndrome> A constellation of behavioural or psychological signs and symptoms including problems with attention, concentration, memory, confusion, anxiety, and depression caused by transient or permanent dysfunction of the brain. Synonym: acute organic brain syndrome, OBS, organic mental syndrome. (05 Mar 2000) |
| organic molecule | <chemistry> A molecule with a basic skeleton made up of a skeleton of carbon atoms plus hydrogen and oxygen atoms and, in proteins, nitrogen. Organic molecules may also include isolated atoms of other elements. (11 Jan 1998) |