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(in prescriptions) if necessary.
Origin of s.o.s.
From the Latin word sī opus sit Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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s.o.s. in Medicine

s.o.s. abbr.
Latin si opus sit (if needed)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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