| norethindrone | <chemical> (l7 alpha)-17 hydroxy-19-norpregn-4-en-20-yn-3-one. A synthetic progestational hormone with actions similar to those of progesterone but functioning as a more potent inhibitor of ovulation. It has weak oestrogenic and androgenic properties. The hormone has been used in treating amenorrhoea, functional uterine bleeding, endometriosis, and for contraception. Pharmacological action: contraceptives, oral, synthetic, progestational hormones, synthetic. Chemical name: 19-Norpregn-4-en-20-yn-3-one, 17-hydroxy-, (17alpha)- (12 Dec 1998) |
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| norethisterone | <chemical> (l7 alpha)-17 hydroxy-19-norpregn-4-en-20-yn-3-one. A synthetic progestational hormone with actions similar to those of progesterone but functioning as a more potent inhibitor of ovulation. It has weak oestrogenic and androgenic properties. The hormone has been used in treating amenorrhoea, functional uterine bleeding, endometriosis, and for contraception. Pharmacological action: contraceptives, oral, synthetic, progestational hormones, synthetic. Chemical name: 19-Norpregn-4-en-20-yn-3-one, 17-hydroxy-, (17alpha)- (12 Dec 1998) |
| norethynodrel | <chemical> (17 alpha)-17-hydroxy-19-norpregn-5(10)-en-20-yn-3-one. A synthetic progestational hormone with actions and uses similar to those of progesterone. It has been used in the treatment of functional uterine bleeding and endometriosis. As a contraceptive, it has usually been administered in combination with mestranol. Pharmacological action: contraceptives, oral, synthetic, progestational hormones, synthetic. Chemical name: 19-Norpregn-5(10)-en-20-yn-3-one, 17-hydroxy-, (17alpha)- (12 Dec 1998) |
| norfenfluramine | <chemical> A fenfluramine analog that inhibits serotonin uptake and may provoke release of serotonin. It is used as an appetite depressant and an experimental tool in animal studies. Pharmacological action: appetite depressants, serotonin agents, serotonin uptake inhibitors. Chemical name: Benzeneethanamine, alpha-methyl-3-(trifluoromethyl)- (12 Dec 1998) |
| norfloxacin | <chemical> 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid. Quinoline-derived synthetic antibacterial agent with a very broad spectrum of action. Oral administration yields highly bactericidal plasma, tissue, and urine levels. Norfloxacin inhibits bacterial DNA-gyrase and is used in gastrointestinal, eye, and urinary infections. Pharmacological action: anti-infective agents, fluoroquinolone, enzyme inhibitors. Chemical name: 3-Quinolinecarboxylic acid, 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)- (12 Dec 1998) |
| norgestrel | <chemical> (+-)-13-ethyl-17-hydroxy-18,19-dinorpregn-4-en-20-yn-3-one. A progestational agent with actions similar to those of progesterone. This racaemic or (+-)-form has about half the potency of the levo form (levonorgestrel). Norgestrel is used as a contraceptive and ovulation inhibitor and for the control of menstrual disorders and endometriosis. Pharmacological action: contraceptives, oral, synthetic, progestational hormones, synthetic. Chemical name: 18,19-Dinorpregn-4-en-20-yn-3-one, 13-ethyl-17-hydroxy-, (17alpha)-(+-)- (12 Dec 1998) |
| norgestrienone | <chemical> 17-hydroxy-19-nor-17 alpha-pregna-4,9,11-trien-20-yn-3-one. A synthetic steroid with progestational and contraceptive activities. Pharmacological action: contraceptives, oral, synthetic, progestational hormones, synthetic. Chemical name: 19-Norpregna-4,9,11-trien-20-yn-3-one, 17-hydroxy-, (17alpha)- (12 Dec 1998) |
| norian | <geology> Pertaining to the upper portion of the Laurentian rocks. Origin: From norite. Source: Websters Dictionary (01 Mar 1998) |
| norie | <zoology> The cormorant. Origin: Etymol. Uncertain. Source: Websters Dictionary (01 Mar 1998) |
| norite | <chemical> A granular crystalline rock consisting essentially of a triclinic feldspar (as labradorite) and hypersthene. Origin: F, fr. Norvege Norway. Source: Websters Dictionary (01 Mar 1998) |
| norium | <chemistry> A supposed metal alleged to have been discovered in zircon. Source: Websters Dictionary (01 Mar 1998) |
| norleucine | <chemical> Chemical name: Norleucine (12 Dec 1998) |
| norm | 1. A rule or authoritative standard; a model; a type. 2. <biology> A typical, structural unit; a type. Origin: L. Norma a rule. See Normal. Source: Websters Dictionary (01 Mar 1998) |
| norma | Synonym: profile. Origin: L. A carpenter's square (05 Mar 2000) |
| norma anterior | The outline of the skull viewed from in front. Synonym: norma anterior, norma frontalis. (05 Mar 2000) |