Bacterium Bac*te"ri*um (b[a^]k*t[=e]"r[i^]*[u^]m), n.; pl. {Bacteria} (b[a^]k*t[=e]"r[i^]*[.a]). [NL., fr. Gr. bakth`rion, ba`ktron, a staff: cf. F. bact['e]rie.] (Biol.) A microscopic single-celled organism having no distinguishable nucleus, belonging to the kingdom Monera. Bacteria have varying shapes, usually taking the form of a jointed rodlike filament, or a small sphere, but also in certain cases having a branched form. Bacteria are destitute of chlorophyll, but in those members of the phylum Cyanophyta (the blue-green algae) other light-absorbing pigments are present. They are the smallest of microscopic organisms which have their own metabolic processes carried on within cell membranes, viruses being smaller but not capable of living freely. The bacteria are very widely diffused in nature, and multiply with marvelous rapidity, both by fission and by spores. Bacteria may require oxygen for their energy-producing metabolism, and these are called {aerobes}; or may multiply in the absence of oxygen, these forms being {anaerobes}. Certain species are active agents in fermentation, while others appear to be the cause of certain infectious diseases. The branch of science with studies bacteria is {bacteriology}, being a division of {microbiology}. See {Bacillus}. [1913 Webster +PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • bacteria — f. microb. Organismo unicelular y procariota perteneciente al reino monera. Su aspecto externo es variado: puede poseer una forma esférica (coco), alargado (bacilo) o helicoidal y aunque se pueden encontrar aisladas, cuando las condiciones son… …   Diccionario médico

  • bacteria — [bak tir′ē ə] pl.n. sing. bacterium [bak tir′ēəm] or bacteria [ModL, pl. of bacterium < Gr baktērion, dim. of baktron, a staff: see BACILLUS] any of a division (Bacteria) of monerans, microorganisms which are typically one celled, have no… …   English World dictionary

  • Bacteria — Bac*te ri*a, n. pl. See {Bacterium}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Bacterĭa — Bacterĭa, Gattung der Gespensterheuschrecken …   Pierer's Universal-Lexikon

  • bacteria — 1847, plural of Mod.L. bacterium, from Gk. bakterion small staff, dim. of baktron stick, rod, from PIE *bak staff used for support. So called because the first ones observed were rod shaped. Introduced as a scientific word 1838 by German… …   Etymology dictionary

  • bactéria — s. f. Nome geral dado aos micróbios unicelulares de forma alongada (bacilos), esférica (cocos) ou espiralada, sem membrana nuclear e que se alimentam segundo o modo vegetal …   Dicionário da Língua Portuguesa

  • bacteria —  Bacteria  Бактерии   Одноклеточные безъядерные живые организмы, обычно диаметром около одного микрона. Бактерии являются одними из самых древних, мельчайших и наиболее простых типов клеток. К настоящему времени описано около десяти тысяч видов… …   Толковый англо-русский словарь по нанотехнологии. - М.

  • bacteria — [n] microorganisms bacilli, germs, microbes, organisms, pathogens; concepts 306,393 …   New thesaurus

  • bacteria — sustantivo femenino 1. Microorganismo formado por una sola célula sin núcleo, que puede causar enfermedades como el cólera, o que interviene en procesos químicos como la fermentación: Hay bacterias buenas y malas para el hombre …   Diccionario Salamanca de la Lengua Española

  • bacteria — (Del gr. βακτηρία, bastón). f. Biol. Microorganismo unicelular procarionte, cuyas diversas especies causan las fermentaciones, enfermedades o putrefacción en los seres vivos o en las materias orgánicas …   Diccionario de la lengua española

  • Bacteria — Taxobox color = lightgrey name = Bacteria fossil range = Archean or earlier Recent image width = 210px image caption = Escherichia coli image is 8 micrometres wide. domain = Bacteria subdivision ranks = Phyla [cite web… …   Wikipedia

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