1. imperative requiring attention or action
  2. enteritis inflammation of the intestine
  3. iterative marked by repetition
  4. interactive capable of influencing each other
  5. intrados the interior curve of an arch
  6. integrative combining and coordinating diverse elements into a whole
  7. interface a surface forming a common boundary between two things
  8. introitus entrance or opening to a hollow organ or tube
  9. interrogative relating to verbs that ask for a reply
  10. interstice small opening between things
  11. intermittent stopping and starting at irregular intervals
  12. inoperative not working or taking effect
  13. undertow a current that flows away from the shore after waves break
  14. intertidal of or relating to the littoral area above the low-tide mark
  15. alterative tending to cure or restore to health
  16. intertrigo chafing between two skin surfaces that are in contact
  17. interaction mutual or reciprocal dealings or influence
  18. intransitivise intransitivize
  19. interrogatively in a questioning format
  20. introduce bring something new to an environment

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