Synonyms of the word

bacterium

• n. (microbiology) A single celled organism with cell walls but no nucleus or organelles.

bacteria

• n. plural of bacterium.
• n. (US) A type, species, or strain of bacterium.
• n. (US, proscribed) Alternative form of bacterium.
• n. (pejorative, slang) A derisive term for a lowlife or a slob (could be treated as plural or singular).
• n. (dated, medicine) An oval bacterium, as distinguished from a spherical coccus or rod-shaped bacillus.

micro-organism

• n. Alternative spelling of microorganism.

microorganism

• n. (microbiology) An organism that is too small to be seen by the unaided eye, especially a single-celled…