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Infusoria

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WordReference Random House Unabridged Dictionary of American English © 2025

In•fu•so•ri•a n.pl.

protozoans of the phylum Ciliophora (or class Ciliata).
(formerly) any of various microscopic organisms found in infusions of decaying organic matter.

Neo-Latin, neuter plural of infūsōrius. See infuse, -ory¹
1780–90

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