1. (initialism) .  high-definition.
  2. (initialism) .  Harley Davidson - a motorcycle brand.
  3. (initialism) .  high density.
  4. (initialism) .  (computing) hard drive or hard disk or hard disc.
  5. (initialism) .  (medicine) hemodialysis.

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This entry was last updated on RefTopia from its source on 3/20/2012.