Read the excerpt from The Hot Zone by Richard Preston. Then, use an online dictionary to find the meaning of the word biohazard. A military biohazard operation was about to go down in a suburb of Washington, and he sure as hell didn't want the Post to find out about it. –The Hot Zone, Richard Preston Access the dictionary here. What is a biohazard? a type of science that deals with things that are alive and dangerous an accident or tragic event that happens by chance, resulting in a new life-form a biological or chemical substance that is dangerous to humans and the environment a story of the life of a real person who lived very dangerously