1. interstellar space the space between stars
  2. interstellar between or among stars
  3. interstellar medium interstellar space including streams of protons moving from the stars
  4. intercellular substance the body substance in which tissue cells are embedded
  5. interplanetary space the part of outer space within the solar system
  6. winter solstice December 22, when the sun is at its southernmost point
  7. interest group (usually plural) a social group whose members control some field of activity and who have common aims
  8. interest expense interest paid on loans
  9. intersperse introduce into one's writing or speech (certain expressions)
  10. interspersal the act of combining one thing at intervals among other things
  11. interpersonal occurring among or involving several people
  12. interest rate the percentage of a sum of money charged for its use
  13. interstice small opening between things
  14. intercellular located between cells
  15. enterostenosis abnormal narrowing of the intestine
  16. interspersion the act of combining one thing at intervals among other things
  17. interstitial tissue tissue between the cells of a structure or part in plant or animal
  18. intercostal muscle muscles between the ribs; they contract during inspiration
  19. intracellular located or occurring within a cell or cells
  20. intergalactic space the space between galaxies