| OET | oral endotracheal tube; oral esophageal tube |
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| OHI | Occupational Health Institute; operative hypertension indicator; oral hygiene index; Oral Hygiene In... |
| NK cell | Natural Killer cell |
| CNL | cardiolipin natural lecithin; chronic neutrophilic leukemia |
| DND | died a natural death |
natural purification (자정 작용
| natural language processing | Computer processing of a language with rules that reflect and describe current usage rather than prescribed usage. (12 Dec 1998) |
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| natural mutation | A mutation which occurs by itself without first being affected by a mutagen, for example during the process of DNA replication. Spontaneous mutations arise at a remarkably constant rate. The rate that spontaneous mutations arise has been used as an evolutionary clock to estimate how closely related two (or more) separate species are to each other. (09 Oct 1997) |
| natural passive immunity | Immunity conferred by the mother on the foetus or newborn. (14 Nov 1997) |
| natural pigment | A naturally occurring coloured compound; absorbs light in the visible range of the electromagnetic spectrum. Compare: structural colour. Synonym: biochrome. (05 Mar 2000) |
| natural products | Naturally occurring compounds that are end products of secondary metabolism; often, they are unique compounds for particular organisms or classes of organisms. (05 Mar 2000) |
| natural selection | The hypothesis that genotype environment interactions occurring at the phenotypic level lead to differential reproductive success of individuals and hence to modification of the gene pool of a population. (18 Nov 1997) |
| immunity, natural | The capacity of a normal organism to remain unaffected by microorganisms and their toxins. It results from non-specific mechanisms such as genetic endowment, naturally occurring antiviral and bactericidal substances, phagocytosis, and constitutional factors such as body temperature, oxygen tension, and age. (12 Dec 1998) |
| killer cells, natural | Cells responsible for spontaneous cytotoxicity of a variety of tumour cells without prior immunization. These natural killer cells are found in non-immune humans and experimental animals and are thought by some to be the same as killer cells (killing by antibody-dependent cell cytotoxicity), but they can also kill in the absence of antibody. (12 Dec 1998) |
| amber fish | <zoology> A fish of the southern Atlantic coast (Seriola Carolinensis) Source: Websters Dictionary (01 Mar 1998) |
| anadromous fish | Anadromous fish means fish which spawn in fresh water and spend a portion of their lives in the ocean. (09 Oct 1997) |
| angel fish | See Angel. Source: Websters Dictionary (01 Mar 1998) |
| archer fish | <zoology> A small fish (Toxotes jaculator), of the East Indies; so called from its ejecting drops of water from its mouth at its prey. The name is also applied to Chaetodon rostratus. Source: Websters Dictionary (01 Mar 1998) |
| balloon fish | <zoology> A fish of the genus Diodon or the genus Tetraodon, having the power of distending its body by taking air or water into its dilatable oesophagus. See Globefish, and Bur fish. Source: Websters Dictionary (01 Mar 1998) |
| band fish | <zoology> A small red fish of the genus Cepola; the ribbon fish. Source: Websters Dictionary (01 Mar 1998) |
| barber fish | <zoology> See Surgeon fish. Source: Websters Dictionary (01 Mar 1998) |