= protozoan, adj. Also in extended (non-technical) use: designating or associated with very primitive forms or stages of animal life.

(a) Geology lying beneath the strata which contain remains of living organisms; (b) Zoology of or pertaining to the Hypozoa (New Sydenham Soc. Lexicon…

Of or relating to protozoans; of the nature of a protozoan; esp. (of a disease) caused by a parasitic protozoan.

Of, relating to, designating, or characteristic of a protozoan; (of a disease) caused by a parasitic protozoan.