Lactam Lac"tam, n. [Lactone + amido.] (Chem.) One of a series of anhydrides of an amido type, analogous to the lactones, as oxindol; a cyclic amide. [1913 Webster]

{beta-lactam} or {[beta]-lactam}, (a) a lactam in which the amide bond is contained within a four-membered ring, which includes the amide nitrogen and the carbonyl carbon. (b) an antibiotic containing a beta-lactam, such as a {penicillin}, {cephalosporin}, or {carbapenem}; also called a {beta-lactam antibiotic}. [informal, laboratory slang] [PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • penicillin — pen i*cil lin, n. [From Penicillium, the fungus genus from which it was first isolated.] (Chem.) Any of a variety of substances having a structure containing a beta lactam ring fused to a thiirane ring, to which a carboxyl group is attached, most …   The Collaborative International Dictionary of English

  • Penicillin — Sn (ein Antibiotikum) erw. fach. (20. Jh.) Entlehnung. Entlehnt aus ne. penicillin, dieses aus l. Penicillium notatum, dem Namen eines Schimmelpilzes, aus l. pēnicillium Pinsel, Wundfäden, gezupfte Leinwand , einem Diminutivum zu l. pēniculus m.… …   Etymologisches Wörterbuch der deutschen sprache

  • penicillin — penicillin. См. пенициллин. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Penicillin — Penicillin, erstes ⇒ Antibiotikum; 1923 von Alexander Fleming als gegen grampositive Eubakterien wirksames Peptid entdeckt. P. wird von Arten des Pinselschimmels Penicillium produziert; es konnte erst 1940 isoliert werden. Die Wirksamkeit der… …   Deutsch wörterbuch der biologie

  • penicillin — 1929, coined in English by Alexander Fleming (1881 1955), who first recognized its antibiotic properties, from Mod.L. Penicillium notatum (1867), the name of the mould from which it was first obtained, from L. penicillus paintbrush (see PENCIL… …   Etymology dictionary

  • Penicillin — ↑ Penizillin …   Das Herkunftswörterbuch

  • penicillin — ► NOUN ▪ an antibiotic produced naturally by certain blue moulds and now usually prepared synthetically. ORIGIN from Latin penicillum paintbrush …   English terms dictionary

  • penicillin — [pen΄i sil′in] n. [< PENICILLIUM + IN1] any of a group of isomeric, antibiotic compounds with the general formula C9H11N2O4SR, obtained from the filtrates of certain molds (esp., Penicillium notatum and P. chrysogenum) or produced… …   English World dictionary

  • Penicillin — For the Japanese band, see Penicillin (band). Penicillin core structure. The R is the variable group. Penicillin (sometimes abbreviated PCN or pen) is a group of antibiotics derived from Penicillium fungi.[1] They include …   Wikipedia

  • Penicillin — Strukturformel Strukturformeln der Penicillin …   Deutsch Wikipedia

  • Penicillin — Historically, the most famous of all antibiotics, named for the fungal mould Penicillium notatum from which it is derived. Penicillin acts by destroying the cell wall in those bacteria that are sensitive have been developed (not resistant) to its …   Medical dictionary

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