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definitions
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q.h.

  1. (in prescriptions) each hour; every hour.
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Origin of q.h.

From the Latin word quāque hōrā
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

q.h. in Medicine

q.h.

abbr.
  1. quaque hora (every hour)
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.