protozoon (also protozoan)

n (pl -zoa / -5zEUE; -`zoE/) any of a large group of very small, usu one-celled, living things, that can be seen only under a microscope 原生动物.

protectionist, protective, protective custody, protectively, protector, protectorate, protege (fem 阴性作 protegee), protein, protein-rich, protest, Protestant, Protestantism, protestation, protester, protestingly, protocol, proton, protoplasm, prototype, protozoan, protract, protracted, protraction, protractor, protrude, protrusion, protrusive, protuberance, protuberant, proud, proudly, Prov, provable, provably, prove, proven, provenance, provender, proverb, proverbial,