- quaternary compound
- a compound composed of four elements.
Medical dictionary. 2011.
quaternary compound
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Quaternary ammonium muscle relaxants — are quaternary ammonium salts used as drugs for muscle relaxation, most commonly in anasthesia. It is necessary to prevent spontaneous movement of muscle during surgical operations. Muscle relaxants inhibit neuron transmission to muscle by… … Wikipedia
quaternary ammonium compound — n any of numerous strong bases and their salts derived from ammonium by replacement of the hydrogen atoms with organic radicals and important esp. as surface active agents, disinfectants, and drugs called also quat, quaternary * * * an organic… … Medical dictionary
Quaternary ammonium cation — Quaternary ammonium cations, also known as quats, are positively charged polyatomic ions of the structure NR4+ with R being alkyl groups. Unlike the ammonium ion NH4+ itself and primary, secondary, or tertiary ammonium cations, the quaternary… … Wikipedia
quaternary — [kwät′ər ner΄ē, kwə tʉr′nə rē] adj. [L quaternarius < quaterni, four together, four each < quater, four times < base of quattuor,FOUR] 1. consisting of four; in sets of four 2. [usually Q ] designating or of the second and current… … English World dictionary
quaternary ammonium compound — n. any of a class of compounds in which the four hydrogen atoms of the ammonium radical are replaced by other groups, generally organic radicals: used as solvents, disinfectants, etc … English World dictionary
quaternary ammonium compound — noun a compound derived from ammonium with hydrogen atoms replaced by organic groups; used as surface active agents, disinfectants, and in drugs • Hypernyms: ↑organic compound * * * noun also quaternary ( es) : any of a large class of strong… … Useful english dictionary
quaternary — 1. Denoting a chemical compound containing four elements; e.g., NaHSO4. Cf.:q. structure. 2. Fourth in a series. 3. Relating to organic compounds in which some central atom is attached to four functional groups; applied to the usually trivalent… … Medical dictionary
Compound semiconductor — A compound semiconductor is a semiconductor compound composed of elements from two or more different groups of the periodic table [1]. These semiconductors typically form in groups 13 16 (old groups III VI), for example of elements from group 13… … Wikipedia
quaternary ammonium compound — Chem. any of a class of salts derived from ammonium in which the nitrogen atom is attached to four organic groups, as in benzalkonium chloride; the salts are cationic surface active compounds used as antiseptics and disinfectants. Also called… … Universalium
quaternary — [kwə tə:n(ə)ri] adjective 1》 fourth in order or rank. 2》 (Quaternary) Geology relating to or denoting the most recent period in the Cenozoic era, following the Tertiary period (comprising the Pleistocene and Holocene epochs and beginning 1.64… … English new terms dictionary
