[ 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 Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for infusorian

British Dictionary definitions for infusorian


/ (ˌɪnfjʊˈzɔːrɪən) /

noun obsolete

any of the microscopic organisms, such as protozoans and rotifers, found in infusions of organic material
any member of the subclass CiliataSee ciliate (def. 3)


of or relating to infusorians

Derived Forms

infusorial, adjective

Word Origin for infusorian

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