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bacteria

microbes / single-celled organisms / prokaryotes

/bækˈtɪəɹ.ɪ.ə/

[C] Countable
pl: bacteria

This term carries a dual connotation, oscillating between the clinical sterility of a laboratory and the visceral fear of infection. While it often evokes images of illness or contamination in a medical context, it is equally used in biological and environmental contexts to describe essential life-sustaining processes, such as nitrogen fixation in soil or digestion in the gut. Grammatically, this word is the plural form of bacterium. In common usage, it is frequently treated as a collective mass noun, but in formal scientific writing, it remains strictly plural. Because it is the plural form, it requires a plural verb (e.g., bacteria are) rather than a singular one, though this distinction is often blurred in casual speech.

Technically the plural form of 'bacterium', though in common usage it is often treated as a collective mass noun when referring to an unspecified amount of germs.

💬Casual Conversation

🎬Tuesday afternoon; Sarah is staring at a smudge on her desk while David is in a meeting.
David Smith

Just read that the office keyboards are breeding grounds for bacteria. We need to pivot to a 'hygiene-first' workspace.

David Smith
Sarah
Sarah

I'm barely keeping my head above water, David. Please just leave me alone.

💡
David uses a corporate buzzword ('pivot') to describe a simple cleaning task, while Sarah uses the idiom 'keeping my head above water' to express that she is overwhelmed with work and lacks the mental capacity for his distractions.

Meanings

Noun

Microscopic, single-celled organisms that lack a distinct nucleus and can be found in nearly every environment on Earth; some are beneficial while others cause disease.

"The scientist studied the bacteria culture under a microscope to identify the strain."

Etymology

Derived from the Modern Latin bacteria, which is the plural form of bacterium. The term originates from the Greek bakterion, meaning a small staff or cane, referring to the rod-like shape of many bacterial cells observed under early microscopy.

Last Updated: June 8, 2026Report an Error