hor. som.

Origin of hor. som.

From the Latin word hōrā somnī at the hour of sleep
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hor. som. in Medicine

hor. som.

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