| street drug | A controlled substance taken for non-medical purposes. Street drugs comprise various amphetamines, anaesthetics, barbiturates, opiates, and psychoactive drugs, and many are derived from natural sources (e.g., the plants Papaver somniferum, Cannibis sativa, Amanita pantherina, Lophophora williamsii). Slang names include acid (lysergic acid diethylamide), angel dust (phencyclidine), coke (cocaine), downers (barbiturates), grass (marijuana), hash (concentrated tetrahydrocannibinol), magic mushrooms (psilocybin), mescaline (peyote), speed (amphetamines). During the 1980s, a new class of "designer drugs" arose, mostly analogs of psychoactive substances intended to escape regulation under the Controlled Substances Act. Also, crack cocaine, a potent, smokable form of cocaine, emerged as a major public health problem. In the U.S. Illicit use of drugs such as cocaine, marijuana, and heroin historically has occurred in cycles. Synonym: recreational drug. (05 Mar 2000) |
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| street drugs | Drugs obtained and often manufactured illegally for the subjective effects they are said to produce. They are often distributed in urban areas, but are also available in suburban and rural areas, and tend to be grossly impure and may cause unexpected toxicity. (12 Dec 1998) |
| street virus | An isolate of rabies virus from a naturally infected domestic animal. (05 Mar 2000) |
| genetic fitness | In a phenotype, the mean number of surviving offspring that it generates in its lifetime, usually expressed as a fraction or percentage of the average genetic fitness of the population. (05 Mar 2000) |
| clinical fitness | Absence of frank disease or of subclinical precursors. (05 Mar 2000) |
| physical fitness | A state of well-being in which performance is optimal, often as a result of physical conditioning which may be prescribed for disease therapy. (12 Dec 1998) |
| evolutionary fitness | The probability that the line of descent from an individual with a specific trait will not eventually die out. (05 Mar 2000) |
| fitness | 1. Well-being. 2. Suitability. 3. In population genetics, a measure of the relative survival and reproductive success of a given individual or phenotype, or of a population subgroup. 4. A set of attributes, primarily respiratory and cardiovascular, relating to ability to perform tasks requiring expenditure of energy. (05 Mar 2000) |
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