noun

bacterium

bacterium

A single bacterium is invisible to the naked eye.

A single bacterium is invisible to the naked eye.

a/the ((bacterium)) a single bacterium A single bacterium is very small.

Synonyms: microbe, germ

From Greek 'bakterion' ('small staff'). The '-um' ending is a common Latin singular noun ending.

Remember that '-um' is often a singular ending (e.g., curriculum, medium) and '-a' is the plural (bacteria, curricula, media).

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