infusorioid,a.|ɪnfjuːˈsɔərɪɔɪd| [f. infusoria n.pl. + -oid.] Resembling an infusorian. 1853A. Henfrey tr.Braun's Phenomenon of Rejuvenescence in Nature 281 Active, Infusorioid structures..occur not unfrequently in the interior of decaying cells of green fresh-water Algæ.