B2noun
US/ˌmaɪ.kroʊˈɔːr.ɡə.nɪ.zəm/
UK/ˌmaɪ.krəʊˈɔː.ɡə.nɪ.zəm/
A living thing so small that you can only see it with a microscope.
In context
Some microorganisms in the soil help plants grow, while others cause disease.
Short entry. Full notes coming.