1. space travel a voyage outside the Earth's atmosphere
  2. abstract existing only in the mind
  3. spacecraft a craft capable of traveling in outer space
  4. space heater heater consisting of a self-contained unit to warm a room
  5. spice tree Pacific coast tree having aromatic foliage and small umbellate flowers followed by olivelike fruit; yields a hard tough wood
  6. sub-interval an interval that is included in another interval
  7. substrate the substance that is acted upon by an enzyme or ferment
  8. substantial real; having a material or factual existence
  9. apostrophe a mark used to indicate the omission of one or more letters
  10. space probe a rocket-propelled guided missile that can escape the earth's atmosphere; makes observations of the solar system that cannot be made by terrestrial observation
  11. topsy-turvily in disorderly haste
  12. water travel travel by water
  13. space writer a writer paid by the area of the copy
  14. rupestral composed of or inscribed on rock
  15. space-time the four-dimensional coordinate system (3 dimensions of space and 1 of time) in which physical events are located
  16. air travel travel via aircraft
  17. soup-strainer slang for a mustache
  18. substratum any stratum or layer lying underneath another
  19. travel change location
  20. spiderflower any of various often strong-smelling plants of the genus Cleome having showy spider-shaped flowers

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