1. Industrial Workers of the World a former international labor union and radical labor movement in the United States; founded in Chicago in 1905 and dedicated to the overthrow of capitalism; its membership declined after World War I
  2. order Mycrosporidia an order in the subclass Cnidosporidia
  3. system administrator a person in charge of managing and maintaining a computer system of telecommunication system (as for a business or institution)
  4. genus Microcentrum katydids
  5. systems software a program (as an operating system or compiler or utility program) that controls some aspect of the operation of a computer
  6. operating microscope binocular microscope used in surgery to provide a clear view of small and inaccessible parts of the body (as in microsurgery)
  7. genus Microstrobos 2 species of small evergreen shrubs of Australia and Tasmania
  8. electron microscope a microscope that is similar in purpose to a light microscope but achieves much greater resolving power by using a parallel beam of electrons to illuminate the object instead of a beam of light
  9. hand-held microcomputer a portable battery-powered computer small enough to be carried in your pocket
  10. genus Microsporum a genus of fungus of the family Moniliaceae; causes ringworm
  11. genus Microstomus a genus of Pleuronectidae
  12. radiomicrometer radiometer that is extremely sensitive
  13. concerto grosso a baroque composition for orchestra and a group of solo instruments
  14. cardioid microphone a directional microphone with a cardioid pattern of sensitivity
  15. electron microscopy microscopy with the use of electron microscopes
  16. electron microscopic of or relating to or involving an electron microscope
  17. Seven Wonders of the World impressive monuments created in the ancient world that were regarded with awe
  18. incertitude the state of being unsure of something
  19. genus Micropterus American freshwater black basses
  20. genus Microsorium tropical usually epiphytic ferns