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SEM

1.
Optics. scanning electron microscope.
2.
search-engine marketing: a type of online marketing in which a company, organization, or website owner drives traffic to a website by optimizing its ranking or by paying for the website to appear in search-engine results pages.
See also SEO.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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search-engine marketing in Medicine

SEM abbr.
scanning electron microscope

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