mercapto-
combining form
(in chemical compounds) indicating the presence of an HS- group
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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mercapto-
pref.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.