Usually means: Near-infrared spectroscopy measures brain activity.
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We found 6 dictionaries that define the word NIRS:

General (3 matching dictionaries)
  1. NIRS: Dictionary.com
  2. NIRS: Wikipedia, the Free Encyclopedia
  3. NIRS: Wiktionary

Miscellaneous (2 matching dictionaries)
  1. NIRS: Acronym Finder
  2. AbbreviationZ (No longer online)

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

Definitions from Wiktionary (NIRS)

noun:  (uncountable) Abbreviation of near infrared spectroscopy/spectrography.
noun:  Abbreviation of near infrared spectroscope/spectrograph.
noun:  Abbreviation of near infrared spectrogram.

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