/ˌprəʊtəˈzəʊən ||; ˌprotəˈzoən/noun [C] (plural protozoans or protozoa /-ˈzəʊə ||; -ˈzoə/) a very small living thing, usually with only one cell, that can only be seen using a special piece of equipment that makes it look bigger(a microscope) 原生动物（一种很小的生物，在显微镜下才看得见，通常只有一个细胞）