bacterium
/bækˈtɪəɹ.ɪəm/ · bac-te-ri-um
noun
- A single-celled organism with cell walls but no nucleus or organelles. The discovery of bacteria led to significant advancements in the field of microbiology.
noun
- A rod-shaped microorganism. The bacterium was observed under a microscope to study its structure.
Did you know? The word 'bacterium' was initially used to describe all microscopic organisms, but it is now specifically used to refer to single-celled organisms without a nucleus or organelles.