Noun microorganism has 1 sense
  1. microorganism - any organism of microscopic size
    --1 is a kind of
    organism, being
    --1 has part: pilus
    --1 has particulars:
     intestinal flora; virus; moneran, moneron; bacteria, bacterium; microbe, bug, germ; pathogen; protoctist; protist, protistan
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