/ Dictionary / Index I infusorian: Meaning and Definition of Find definitions for: in•fu•so•ri•an Pronunciation: (in"fyoo-sôr'ē-un, -sōr'-), [key] — n. any of the Infusoria. —adj. infusorial. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: infusorian (Thesaurus) infusorial in futuro* Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language