bacteria
bacterium
noun bahk-TEH-ryah Less Common
Origin: From Modern Latin bacteria, from Greek bakterion (small staff), referring to the rod shape.
Usage Note
Bacteria is the singular form in Spanish (unlike English, where 'bacteria' is plural). The plural is bacterias. The related adjective is bacteriano/a. In everyday speech bacteria is often used loosely to mean any germ, though technically it refers only to bacteria, not viruses.
Examples
"Esta bacteria es resistente a los antibióticos."
Natural Translation
This bacterium is resistant to antibiotics.

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