The Collaborative International Dictionary of English v.0.48:
Protozoan \Pro`to*zo"an\, a. (Zool.) Of or pertaining to the Protozoa. -- n. One of the Protozoa. [1913 Webster]WordNet (r) 3.0 (2006):
protozoan adj 1: of or relating to the Protozoa [syn: protozoal, protozoan, protozoic] n 1: any of diverse minute acellular or unicellular organisms usually nonphotosynthetic [syn: protozoan, protozoon]