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Definition: any infection caused by a microorganism that does not normally cause disease in humans; occurs in persons with abnormally functioning immune systems (as AIDS patients or transplant patients receiving immunosuppressive drugs)

Your choice?
  • opportunistic infection
  • opposite  (Definition: two words that express opposing concepts)
  • optical telescope  (Definition: an astronomical telescope designed to collect and record light from cosmic sources)
  • optimism  (Definition: the optimistic feeling that all is going to turn out well)