Entry 2 senses · 2 variants Webster, 1913 Infusory · In·fu·so·ry · IPA a. n. 01 a. Infusorial. 1. Infusorial.(Zool.) 02 n. One of the Infusoria; -- usually in the pl. pl. Infusories 1. One of the Infusoria; -- usually in the pl.(Zool.)