Definition of "microorganisms" []

• Plural form of microorganism. (noun)

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• "These miniature, enclosed aquariums, which contain microorganisms in filtered sea water, employ space age technology initiated by NASA research into self-sustaining communities."
• "I used it to look at everything I could find: microorganisms from the nearby pond, leaves and blades of grass."
• "Airborne exposures to pathogenic microorganisms is considered to be a nearly inconsequential risk, except for direct exposures to liquid aerosols (mists) such as somebody sneezing directly into your face."