51Թ

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h.d.

1

abbreviation for

  1. (in prescriptions) at bedtime.

h.d.

2

abbreviation for

  1. heavy duty.

HD

3

abbreviation for

  1. high-definition; high definition:

    channels that broadcast in HD;

    HD video;

    HD DVDs;

    an HD display on my new tablet.

hd.

4

abbreviation for

  1. hand.
  2. head.

hd

abbreviation for

  1. hand
  2. head
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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51Թ History and Origins

Origin of h.d.1

From New Latin hōra dēcubitūs

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