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Protozoa   /prˌoʊtəzˈoʊə/   Listen
noun
Protozoa  n. pl.  (Zool.) The lowest of the grand divisions of the animal kingdom. 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 Vorticellae. 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, Gregarinae, and Infusoria. See also Foraminifera, Heliozoa, Protoplasta, Radiolaria, Flagellata, Ciliata.






Collaborative International Dictionary of English 0.48








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"Protozoa" Quotes from Famous Books



... regards matter as the dam which keeps back the rush of life. Organize it a little (as in the protozoa)—i.e. slightly raise the sluice—and a little life will squeeze through. Organize it elaborately (as in man)—i.e. raise the sluice a good deal—and much life will squeeze through. Now this may be a very plausible opinion if the flood of life ...
— The Problems of Psychical Research - Experiments and Theories in the Realm of the Supernormal • Hereward Carrington

... into many pieces, reproduce so many perfect individuals: Lyonnet cut a Nais or freshwater worm into nearly forty pieces, and these all reproduced perfect animals.[874] It is probable that segmentation could be carried much further in some of the protozoa, and with some of the lowest plants each cell will reproduce the parent-form. Johannes Mueller thought that there was an important distinction between gemmation and fission; for in the latter case the divided portion, however small, is more ...
— The Variation of Animals and Plants Under Domestication, Volume II (of 2) • Charles Darwin

... beings, such as the protozoa and the simpler algae, fungi, etc., reproduce themselves by means of simple fission. The mother organism may split into two similar halves, as the amoeba does, or, as is more common in the lowest unicellular plants, it may divide into a great number of small ...
— Scientific American Supplement, No. 810, July 11, 1891 • Various

... and I'll give you the name of a trustworthy man. And now let us proceed with the ceremony of marriage. (To THE BRIDEGROOM): John, wilt thou have this woman to be thy wedded wife, to live together in the holy state of eugenic matrimony? Wilt thou love her, comfort her, protect her from all protozoa and bacteria, and keep her in good health; and, forsaking all other, keep thee unto her only, so long as ye both shall live? If so, hold ...
— A Book of Burlesques • H. L. Mencken

... the extreme pressure, their eyes, especially, had a singular appearance, protruding like great globes from their heads. Bivalve and univalve mollusca seem to be rare at the greatest depths; but starfishes, sea urchins and other echinoderms, zoophytes, sponges, and protozoa abound. ...
— Discourses - Biological and Geological Essays • Thomas H. Huxley



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