gel


gel
/jel/, n., v., gelled, gelling.
n.
1. Physical Chem. a semirigid colloidal dispersion of a solid with a liquid or gas, as jelly, glue, etc.
2. Theat. gelatin (def. 5).
3. Biochem. a semirigid polymer, as agarose, starch, cellulose acetate, or polyacrylamide, cast into slabs or cylinders for the electrophoretic separation of proteins and nucleic acids.
v.i.
4. to form or become a gel.
5. jell (def. 2).
[1895-1900; shortening of GELATIN]

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▪ physics and chemistry
      coherent mass consisting of a liquid in which particles too small to be seen in an ordinary optical microscope are either dispersed or arranged in a fine network throughout the mass. A gel may be notably elastic and jellylike (as gelatin or fruit jelly), or quite solid and rigid (as silica gel, a material that looks like coarse white sand and is used as a dehumidifier). Gels are colloids (aggregates of fine particles, as described above, dispersed in a continuous medium) in which the liquid medium has become viscous enough to behave more or less as a solid. Contraction of a gel, causing separation of liquid from it, is called syneresis. Compare sol.

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Universalium. 2010.

Look at other dictionaries:

  • gel — gel …   Dictionnaire des rimes

  • gel — [ ʒɛl ] n. m. • giel 1080; rare du XVIe au XIXe; lat. gelu 1 ♦ Temps de gelée. Persistance, rigueur du gel. « Un matin de gel, où les traîneaux glissaient » (Apollinaire). 2 ♦ Congélation des eaux (et de la vapeur d eau atmosphérique). ⇒ givre,… …   Encyclopédie Universelle

  • gel-1 —     gel 1     English meaning: “to curl; round, *gland, growth, ball, fathom, arm”     Deutsche Übersetzung: “ballen, sich ballen; Gerundetes, Kugeliges” etc     Material: evidence for the unadjusted root form are seldom and partly very doubtful …   Proto-Indo-European etymological dictionary

  • gel — GEL, geluri, s.n. (chim.) Substanţă coloidală cu consistenţă vâscoasă şi însuşiri specifice deopotrivă lichidelor şi solidelor. – Din fr. gel. Trimis de gall, 13.09.2007. Sursa: DEX 98  GEL s. (chim.) 1. (pop.) piftie. 2. gel de silice =… …   Dicționar Român

  • Gel — [ge:l], das; s, e, ugs. auch: s: einer Creme ähnliches, fettfreies Mittel zur Körperpflege: bei Sonnenbrand hilft es, ein kühlendes Gel aufzutragen; hast du Gel in den Haaren? Zus.: Duschgel, Haargel. * * * Gel 〈n. 11; Chem.〉 gallertartige Lösung …   Universal-Lexikon

  • gel — gèl s.m.inv. 1. TS chim. fase solida o semisolida di un colloide, formatasi per raffreddamento o per aggiunta di sostanze gelificanti 2a. CO sostanza gelatinosa impiegata nella fabbricazione di medicinali o cosmetici: un dopobarba in gel; anche… …   Dizionario italiano

  • gel — gȅl m <N mn ovi> DEFINICIJA kem. koloidna homogena tvar, ob. poluprozirna i želatinozne konzistencije koja se koristi za neke kozmetičke i higijenske proizvode [gel za učvršćivanje kose; zubna pasta u gelu; gel za brijanje] ETIMOLOGIJA njem …   Hrvatski jezični portal

  • gel — sustantivo masculino 1. (no contable) Jabón líquido usado para el aseo: Uso un gel de baño con olor a jazmín. 2. Área: química Mezcla de un líquido y una materia coloidal, muy utilizada en farmacia y cosmética: Muchos medicamentos se presentan… …   Diccionario Salamanca de la Lengua Española

  • gel — [1] ► NOUN 1) a jelly like substance containing a cosmetic, medicinal, or other preparation. 2) Chemistry a semi solid colloidal suspension of a solid dispersed in a liquid. ► VERB (gelled, gelling) 1) Chemistry form into a gel. 2) …   English terms dictionary

  • gel — /dʒɛl/ s.m. [da gel(atina )], invar. 1. (chim.) [fase semisolida di un sistema colloidale] ▶◀ gelo. 2. [sostanza colloidale usata per dare forma alla capigliatura e fissare la piega] ▶◀ gelatina, gommina. ‖ brillantina. ⇑ fissativo, fissatore …   Enciclopedia Italiana

  • gel — (n.) 1899, as a chemical term, short for GELATIN (Cf. gelatin) and perhaps influenced by jell. The invention of this word is credited to Scottish chemist Thomas Graham (1805 1869). Hair styling sense is from 1958. The verb meaning to become a gel …   Etymology dictionary


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