| ADS | acute death syndrome; acute diarrheal syndrome; Alcohol Dependence Scale; alternative delivery syste... |
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| AEMIS | Aerospace and Environmental Medicine Information System |
| AFS | acquired or adult Fanconi syndrome; alternative financing system; American Fertility Society; antifi... |
| AHDMS | automated hospital data management system |
| AHES | artificial heart energy system |
| linnaean system of nomenclature | The system of nomenclature in which the names of species are composed of two parts, a generic name and a specific epithet (species name, in botany). Synonym: binary nomenclature, binomial nomenclature. Origin: Carl von Linne (05 Mar 2000) |
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| lutheran blood-group system | A complex blood group system having pairs of alternate antigens and amorphic genes, but also subject to a dominant independently segregating repressor. (12 Dec 1998) |
| lymphatic system | <anatomy> The tissues and organs (including the bone marrow, spleen, thymus and lymph nodes) that produce and store cells that fight infection and the network of vessels that carry lymph. (12 May 1997) |