1. contrast material a substance that is opaque to x-rays
  2. absorbent material a material having capacity or tendency to absorb another substance
  3. adsorbent material a material having capacity or tendency to adsorb another substance
  4. internet site a computer connected to the internet that maintains a series of web pages on the World Wide Web
  5. intermittent stopping and starting at irregular intervals
  6. interferometer any measuring instrument that uses interference patterns to make accurate measurements of waves
  7. internal control an accounting procedure or system designed to promote efficiency or assure the implementation of a policy or safeguard assets or avoid fraud and error etc.
  8. internal medicine the branch of medicine that deals with the diagnosis and (nonsurgical) treatment of diseases of the internal organs (especially in adults)
  9. intermittently in a manner of stopping and starting at irregular intervals
  10. international concerning or belonging to two or more countries
  11. intermediately to an intermediate degree
  12. intermediary a negotiator who acts as a link between parties
  13. interim overhaul an overhaul between the regular times for overhauling
  14. intermediator a negotiator who acts as a link between parties
  15. intermural between two or more institutions etc
  16. written material the work of a writer
  17. covering material a material used by builders to cover surfaces
  18. internal drive a drive mounted inside of a computer
  19. sorbent material a material that sorbs another substance
  20. underestimate make too low an approximation of