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Definition of: Infusoria
(in′fy
·sôr′ē·ə, -sō′rē·ə) noun plural
1. Formerly, a division of the animal kingdom, including especially those microscopic protozoans found in infusions of decaying matter.
2. A class of the phylum Protozoa, characterized by ciliated bodies and free–living aquatic habits, including Paramecium and Stentor: also called Ciliata.
—in′fu·so′ri·an adjective & noun [<NL infusus, pp. of infundere pour into]
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