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hor. som.

  1. (in prescriptions) at bedtime.
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Origin of hor. som.

From the Latin word hōrā somnī at the hour of sleep
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

hor. som. in Medicine

hor. som.

abbr.
  1. hora somni (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.