A microbe is a very small living thing, which you can only see if you use a microscope. = micro-organism. an extremely small living thing which you can only see if you use a microscope. Some microbes can cause diseases (micro- + bios )
A microbe, also called microorganism, is any organism too small to be visible to the naked eye Bacteria, viruses, protozoans, certain fungi and some algae are microorganisms