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h.d.1

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  1. (in prescriptions) at bedtime.
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Origin of h.d.1

From the New Latin word hōra dēcubitūs

h.d.2

  1. heavy duty.
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Doolittle

[doo-lit-l]
noun
  1. HildaH.D., 1886–1961, U.S. poet.
  2. James Harold,1896–1993, U.S. aviator and general.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for h.d.

Doolittle

noun
  1. Hilda. known as H.D. 1886–1961, US imagist poet and novelist, living in Europe
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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

h.d. in Medicine

h.d.

abbr.
  1. hora decubitus (before sleep, at bedtime)
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.