1. heat wave a wave of unusually hot weather
  2. head off prevent the occurrence of; prevent from happening
  3. theta wave the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude
  4. beta wave the normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz
  5. heathen a person who does not acknowledge your god
  6. headphone electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear
  7. heave lift or elevate
  8. headway forward movement
  9. hate the emotion of intense dislike
  10. heathfowl large northern European grouse that is black with a lyre-shaped tail
  11. heat ray a ray that produces a thermal effect
  12. headache pain in the head
  13. head voice the higher ranges of the voice in speaking or singing
  14. stave one of the slats of wood forming sides of a barrel or bucket
  15. heat a form of energy transferred by a difference in temperature
  16. heather a low purple-flowered plant grown in the northern hemisphere
  17. heavy of comparatively great physical weight or density
  18. head ache pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs
  19. heath a low evergreen shrub of the family Ericaceae
  20. hateful evoking or deserving hatred