1. hard disk a rigid magnetic disk mounted permanently in a drive unit
  2. hard disc a rigid magnetic disk mounted permanently in a drive unit
  3. hard tick ticks having a hard shield on the back and mouth parts that project from the head
  4. hard drug a narcotic that is considered relatively strong and likely to cause addiction
  5. hard drink an alcoholic beverage that is distilled rather than fermented
  6. heartsick full of sorrow
  7. heart disease a disease of the heart
  8. hardheads a weedy perennial with tough wiry stems and purple flowers
  9. hard drive computer hardware that holds and spins a magnetic or optical disk and reads and writes information on it
  10. hard-hitting characterized by or full of force and vigor
  11. hardness the quality of being difficult to do
  12. hardiness the property of being physically strong and healthy
  13. hardening the act of making something harder
  14. hardtack very firm unsalted biscuit or bread
  15. hard time a difficulty that can be overcome with effort
  16. Herodotus the ancient Greek known as the father of history
  17. heart attack a sudden severe instance of abnormal heart function
  18. carditis inflammation of the heart
  19. hardback having a hard back or cover
  20. RAM disk (computer science) a virtual drive that is created by setting aside part of the random-access memory to use as if it were a group of sectors