S.

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semis

 (ss.) [se´mis] (L.)
half.

signa

 [sig´nah] (L.)
mark or write; abbreviated S. or sig. in prescriptions, followed by the signature.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

S.

abbr.
1. saint
2. sea
3. Medicine signature
4.
a. signor
b. signore
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.