microbe

noun
  1. A microorganism, especially a bacterium causing disease or fermentation. noun
    Scientists are studying the microbe to understand its role in the disease.
    The microbe was found to be responsible for the fermentation process in the production of yogurt.
  2. A microscopic organism, which may be a single cell or multicellular organism, that can exist in various environments. noun
    Microbes play a crucial role in the ecosystem by breaking down organic matter.
    The diversity of microbes in the soil is essential for healthy plant growth.