| naphtholate | A compound of naphthol in which the hydrogen in the hydroxyl radical is substituted by a base. (05 Mar 2000) |
|---|---|
| naphthols | Naphthalene derivatives carrying one or more hydroxyl (-oh) groups at any ring position. They are often used in dyes and pigments, as antioxidants for rubber, fats, and oils, as insecticide, in pharmaceuticals, and in numerous other applications. (12 Dec 1998) |
| naphthoquinone | <chemistry> A yellow crystalline substance, C10H6O2, analogous to quinone, obtained by oxidizing naphthalene with chromic acid. Origin: Naphthalene + quinone. Source: Websters Dictionary (01 Mar 1998) |
| naphthoquinones | Naphthalene rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups. (12 Dec 1998) |
| naphthyl | <chemistry> A hydrocarbon radical regarded as the essential residue of naphthalene. Origin: Naphthalene + -yl. Source: Websters Dictionary (01 Mar 1998) |
| naphthylamine | <chemistry> One of two basic amido derivatives of naphthalene, C10H7.NH2, forming crystalline solids. Source: Websters Dictionary (01 Mar 1998) |
| naphthylvinylpyridine | <chemical> 4(1-naphthylvinyl)pyridine hydrochloride. Cholinesterase inhibitor. Synonym: yub 25. Chemical name: Pyridine, 4-(2-(1-naphthalenyl)ethenyl)- (12 Dec 1998) |
| napier | Synonym: neper. Origin: John Napier, Scottish mathematician, 1550-1617 (05 Mar 2000) |
| napier's rods | A set of rods, made of bone or other material, each divided into nine spaces, and containing the numbers of a column of the multiplication table; a contrivance of Baron Napier, the inventor of logarithms, for facilitating the operations of multiplication and division. Source: Websters Dictionary (01 Mar 1998) |
| napiform | <botany> Turnip-shaped; large and round in the upper part, and very slender below. Origin: L. Napus turnip: cf. F. Napiforme. Cf. Navew. Source: Websters Dictionary (01 Mar 1998) |
| napkin rash | Colloquially referred to as diaper, ammonia, or napkin rash; dermatitis of thighs and buttocks resulting from exposure to urine and faeces in infants' diapers. Formerly attributed to ammonia formation; moisture, bacterial growth, and alkalinity may all induce lesions. Synonym: ammonia rash, diaper rash, Jacquet's erythema, napkin rash. (05 Mar 2000) |
| nappe | <geometry> Sheet; surface; all that portion of a surface that is continuous in such a way that it is possible to pass from any one point of the portion to any other point of the portion without leaving the surface. Thus, some hyperboloids have one nappe, and some have two. Origin: F. Nappe cloth, sheet. See Napery. Source: Websters Dictionary (01 Mar 1998) |
| naprapathy | A system of therapeutic manipulation based on the theory that morbid symptoms are dependent upon strained or contracted ligaments in the spine, thorax, or pelvis. Origin: Bohemian napravit, to correct, + G. Pathos, suffering (05 Mar 2000) |
| naproxen | <chemical> 2-(6-methoxy-2-naphthyl)propionic acid. An anti-inflammatory agent with analgesic and antipyretic properties. Both the acid and its sodium salt are used in the treatment of rheumatoid arthritis and other rheumatic or musculoskeletal disorders, dysmenorrhoea, and acute gout. Pharmacological action: non-steroidal anti-inflammatory agents, cyclooxygenase inhibitors, gout suppressants. Chemical name: 2-Naphthaleneacetic acid, 6-methoxy-alpha-methyl-, (S)- (12 Dec 1998) |
| napsylate | USAN-approved contraction for 2-naphthalenesulfonate. (05 Mar 2000) |