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[in-fyoo-sawr-ee-uh n, -sohr-] /ˌɪn fyʊˈsɔr i ən, -ˈsoʊr-/
any of the Infusoria.
Origin of infusorian
First recorded in 1855-60; Infusori(a) + -an Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for infusorian
Historical Examples
  • In fact, the infusorian simply swallows whatever happens to hit his mouth.

    Natural Wonders Edwin Tenney Brewster
  • So far as we can see, therefore, everything that the infusorian feels at all, feels to him exactly like everything else.

    Natural Wonders Edwin Tenney Brewster
  • Thus the plant, that seems to know two things, is twice as well off as the infusorian that knows only one.

    Natural Wonders Edwin Tenney Brewster
  • The exchange of life-elements between two individuals is well illustrated in the case of the infusorian Noctiluca.

    The Drama of Love and Death Edward Carpenter
  • This has been shown by the careful experiments of Maupas, who had observed 215 generations of an infusorian without sexual union.

    Degeneracy Eugene S. Talbot
  • The infusorian can be called potentially immortal, because of this method of reproduction.

    Applied Eugenics Paul Popenoe and Roswell Hill Johnson
  • Now the single-celled infusorian is in many respects comparable with the single-celled germ of the higher animals.

    Applied Eugenics Paul Popenoe and Roswell Hill Johnson
British Dictionary definitions for infusorian


noun (obsolete)
any of the microscopic organisms, such as protozoans and rotifers, found in infusions of organic material
any member of the subclass Ciliata See ciliate (sense 3)
of or relating to infusorians
Derived Forms
infusorial, adjective
Word Origin
C18: from New Latin Infusoria former class name; see infuse
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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