Usually means: Scanning electron microscope for imaging.
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We found 37 dictionaries that define the word sem:

General (15 matching dictionaries)
  1. SEM, sem: Merriam-Webster
  2. SEM, Sem, sem: Oxford Learner's Dictionaries
  3. SEM, Sem: American Heritage Dictionary of the English Language
  4. Sem: Collins English Dictionary
  5. Sem, sem, sem: Wordnik
  6. SEM, Sem, sem: Wiktionary
  7. sem: Webster's New World College Dictionary, 4th Ed.
  8. Sem: Infoplease Dictionary
  9. SEM, sem: Dictionary.com
  10. SEM, Sem (artist), Sem: Wikipedia, the Free Encyclopedia
  11. sem: MyWord.info
  12. SEM: Stammtisch Beau Fleuve Acronyms
  13. SEM, Sem: TheFreeDictionary.com
  14. sem: American Heritage Dictionary of the English Language
  15. sem: Infoplease Dictionary

Art (1 matching dictionary)
  1. ODLIS: Online Dictionary of Library and Information Science (No longer online)

Business (1 matching dictionary)
  1. Glossary of Trade and Shipping Terms (No longer online)

Computing (5 matching dictionaries)
  1. SEM: Free On-line Dictionary of Computing
  2. SEM: Netlingo
  3. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  4. Webopedia (No longer online)
  5. SEM: Encyclopedia

Medicine (6 matching dictionaries)
  1. SEM: Merriam-Webster Medical Dictionary
  2. SEM: MedTerms.com Medical Dictionary
  3. online medical dictionary (No longer online)
  4. Sleep Terms (No longer online)
  5. SEM: Medical dictionary
  6. SEM: Drug Medical Dictionary

Miscellaneous (3 matching dictionaries)
  1. baby names list (No longer online)
  2. SEM: Acronym Finder
  3. AbbreviationZ (No longer online)

Religion (1 matching dictionary)
  1. Sem: Smith's Bible Dictionary

Science (1 matching dictionary)
  1. SEM: A Dictionary of Quaternary Acronyms and Abbreviations

Slang (1 matching dictionary)
  1. SEM: Urban Dictionary

Tech (3 matching dictionaries)
  1. Book Binding (No longer online)
  2. AUTOMOTIVE TERMS (No longer online)
  3. Glossary of Meteorology (No longer online)

Definitions from Wiktionary (SEM)

noun:  Clipping of seminary. [A theological school for the training of rabbis, priests, or ministers.]
noun:  Clipping of semester. [Half of a school year (US) or academic year such as autumn or spring semester.]
noun:  Clipping of semicolon. [The punctuation mark ;.]
adjective:  Abbreviation of Semitic. [Of or pertaining to a subdivision of Afroasiatic Semitic languages: Amharic, Arabic, Aramaic, Syriac, Akkadian, Hebrew, Maltese, Tigrigna, Phoenician etc.]
noun:  Initialism of scanning electron microscope. [An electron microscope whose image is made up of a matrix of points from scanning the surface of a sample.]
noun:  Initialism of scanning electron microscopy. [microscopy using a scanning electron microscope]
noun:  Initialism of secondary electron multiplier.
noun:  (SEO) Initialism of search engine marketing.
noun:  (statistics) Initialism of standard error of the mean.
noun:  (computer security) Initialism of security event management.

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