Any living organism too small to be seen with the naked eye, including bacteria, viruses, fungi, protozoa, and algae.
Origin
From Greek mikros (small) + organismos (organism). The compound entered scientific English in the 19th century as microscopy made invisible life visible.
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🎧 Podcast 2 — Daily Use
Micro-organism in Conversation
Two British speakers · Real everyday dialogue
⚠ Google UK English voices not detected. Transcript-only mode active.