s.o.s.

(in prescriptions) if necessary.

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. in Medicine

s.o.s.

abbr.

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.