1. atmosphere the envelope of gases surrounding any celestial body
  2. excellent very good; of the highest quality
  3. standard atmosphere a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
  4. left hemisphere the cerebral hemisphere to the left of the corpus callosum that controls the right half of the body
  5. western hemisphere the hemisphere that includes North America and South America
  6. eastern hemisphere the hemisphere that includes Eurasia and Africa and Australia
  7. extended time scale (simulation) the time scale used in data processing when the time-scale factor is greater than one
  8. excellence possessing good qualities in high degree
  9. celestial sphere the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
  10. Iceland moss lichen with branched flattened partly erect thallus that grows in mountainous and Arctic regions; used as a medicine or food for humans and livestock; a source of glycerol
  11. Iceland spar a transparent calcite found in Iceland and used in polarizing microscopes
  12. asthenosphere the lower layer of the crust
  13. Saint Elmo's fire an electrical discharge accompanied by ionization of surrounding atmosphere
  14. Saint Ulmo's fire an electrical discharge accompanied by ionization of surrounding atmosphere
  15. magnetosphere the magnetic field of a planet
  16. exclusive admitting or accepting only a particular group
  17. exosphere the outermost atmospheric layer
  18. excellently extremely well
  19. exculpatory clearing of guilt or blame
  20. existential philosopher a philosopher who emphasizes freedom of choice and personal responsibility but who regards human existence in a hostile universe as unexplainable