fNIRS
noun
fNIRS is a noun meaning “Acronym of functional near infrared spectroscopy” (English Wiktionary, September 2026). It is spelled F-N-I-R-S, and it appears about once in every 68 million words in written English (wordfreq, 2021 data).
What does fNIRS mean?
noun
- 1
Acronym of functional near infrared spectroscopy.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is fNIRS?
FNIRS appears about once in every 68 million words in written English, the 258,950th most frequent word form in the list.
fNIRS0.0010.010.11101001,00010,000
rarerper million words of written Englishmore common
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Where does fNIRS come from?
From f- + NIRS.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).