Meaning & use
microorganism
A living organism too small to be seen without a microscope, such as bacteria or fungi.
See it in a sentence
Yogurt is made by allowing beneficial microorganisms to slowly ferment fresh milk.
Certain microorganisms manage to thrive in extremely hot underwater vents.
A note on using this word
Microorganism is the precise scientific term, while microbe and germ are common in everyday speech.
Words with a similar meaning
microbegerm
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
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