s.o.s.
- (in prescriptions) if necessary.
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Origin of s.o.s.
From the Latin word sī opus sit
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
s.o.s.
- si opus sit (if needed)
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.