microorganism definition

  • noun:
    • An organism of microscopic or submicroscopic size, specifically a bacterium or protozoan.
    • An organism that's also tiny to be noticed because of the unaided eye, specially a single-celled system, including a bacterium.
    • Any microscopic kind of life; a form of life also little to be seen because of the naked-eye; -- specifically put on bacteria, protozoa, yeasts, and similar organisms, esp. such are supposed to trigger infectious diseases.
    • A microscopic system, as a bacillus, bacterium, or vibrio; a microbe; a microzoary.
    • any organism of microscopic dimensions
    • any organism of microscopic size

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