Protozoa Pro`to*zo"a, n. pl. [NL., fr. Gr. ? first + zo^,on an animal.] (Zo["o]l.) The lowest of the grand divisions of the animal kingdom. [1913 Webster]

Note: The entire animal consists of a single cell which is variously modified; but in many species a number of these simple zooids are united together so as to form a compound body or organism, as in the Foraminifera and Vorticell[ae]. The reproduction takes place by fission, or by the breaking up of the contents of the body after encystment, each portion becoming a distinct animal, or in other ways, but never by true eggs. The principal divisions are Rhizopoda, Gregarin[ae], and Infusoria. See also {Foraminifera}, {Heliozoa}, {Protoplasta}, {Radiolaria}, {Flagellata}, {Ciliata}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

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  • Protozŏa — Protozŏa, 1) so v.w. Urthierchen; 2) so v.w. Monadina …   Pierer's Universal-Lexikon

  • Protozoa — Protozoa, einzellige Tiere, tierische ⇒ Protisten; eukaryotische, heterotrophe, einzellige Organismen, die in ihrer Grundorganisation der ⇒ Tierzelle entsprechen. Als eigener Organismus hat die P.zelle alle für biologische Systeme notwendigen… …   Deutsch wörterbuch der biologie

  • protozoa — (n.) 1834, from Modern Latin, coined 1818 by German zoologist Georg August Goldfuss (1782 1848) from Gk. protos first (see PROTO (Cf. proto )) + zoia, plural of zoion animal (see ZOO (Cf. zoo)). Related: Protozoan …   Etymology dictionary

  • protozoa — protozȍa ž DEFINICIJA biol. mikroskopski organizam, morfološki na razini stanice, stanovnik je vode ili vlažne zemlje; živi slobodno u prirodi, zatim kao komensal i parazit; praživotinja ETIMOLOGIJA nlat. ≃ proto + zoa …   Hrvatski jezični portal

  • Protozoa — Leishmania donovani, (a species of protozoa) in a bone marrow cell Protozoa are a diverse group of single cell eukaryotic organisms,[1] many of which are motile. Throughout history, protozoa have been defined as single cell protists …   Wikipedia

  • Protozoa — Protozoaire En Biologie, le terme Protozoaire (Protozoa, du grec ancien proto (« premier ») et du suffixe zoa (« animal »)) désigne les protistes (eucaryotes unicellulaires) hétérotrophes qui ingèrent leur nourriture par… …   Wikipédia en Français

  • Protozoa — A very diverse group comprising some 50,000 eukaryotic organisms that consist of one cell. Because most of them are motile and heterotrophic, the Protozoa were originally regarded as a phylum of the animal kingdom. However it is now clear that… …   Dictionary of molecular biology

  • Protozoa — A single cell organism that can only divide within a host organism. Malaria is caused by a protozoa: Plasmodium. Other protozoan parasites Giardia and Toxoplasma. * * * Formerly considered a phylum, now regarded as a subkingdom of the animal… …   Medical dictionary

  • Protozoa — Protozoon Pro to*zo [ o]n ( [o^]n), n.; pl. {Protozoa}. [NL.] (Zo[ o]l.) (a) One of the Protozoa. (b) A single zooid of a compound protozoan. [1913 Webster] …   The Collaborative International Dictionary of English

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