1. extragalactic nebula a collection of star systems
  2. cynical believing the worst of human nature and motives
  3. extreme right-winger an extreme conservative
  4. electromechanical of or relating to or involving an electrically operated mechanical device
  5. external angle the supplement of an interior angle of a polygon
  6. extremely high frequency 30 to 300 gigahertz
  7. extremely to the greatest possible degree
  8. extramarital characterized by adultery
  9. extreme unction a Catholic sacrament
  10. extrapolate draw from specific cases for more general cases
  11. extragalactic outside or beyond a galaxy
  12. extralegal not regulated or sanctioned by law
  13. extremely low frequency below 3 kilohertz
  14. external gill occurs in some mollusks and in tadpoles and other immature amphibians
  15. external auditory canal either of the passages in the outer ear from the auricle to the tympanic membrane
  16. extraterritorial outside territorial limits or jurisdiction
  17. thermoelectrical involving or resulting from thermoelectricity
  18. external organ an organ that is situated on or near the surface of the body
  19. mnemotechnical of or relating to or involved the practice of aiding the memory
  20. extraordinary highly unusual or exceptional or remarkable

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