spectrometer

Etymology

The OED takes it as borrowed from German Spektrometer or French spectromètre, and compares French spectrométrie, recorded in 1872.^[2] Etymonline also derives it from the German word, which it credits to Moritz Meyerstein in 1863.^[3] It is made up of spectro- and -meter,^[3][4][5] and Merriam-Webster labels it International Scientific Vocabulary.^[6][7][8] Klein calls it a hybrid of Latin spectrum (“appearance, image”) and Ancient Greek μέτρον (métron, “measure”).^[9]

Earliest recorded meaning

An instrument for measuring the index of refraction: 1874, in a translation of E. Lommel's Nature of Light.^[2] Merriam-Webster also dates it to 1874;^[6][7] Etymonline gives 1863,^[3] and Dictionary.com 1870–75.^[5]

Semantic evolution

The first spectrometers measured how far a prism bent a ray of light, and so the refractive index of the prism's substance.^[2][3][6] Merriam-Webster also uses the word for a spectroscope fitted for measuring the spectra seen through it.^[6] The meaning then widened to any of many instruments that produce spectra and measure their features,^[2][4] including analytical instruments that spread out an emission of particles or radiation by mass or energy, as in the mass spectrometer.^[7][10]

Timeline

• 1874 – an instrument for measuring the index of refraction.^[2][6]

Meanings

Noun

1. An instrument that produces a spectrum and measures its features, such as wavelength, energy or intensity.^[10][4][2]
2. Any of various analytical instruments that spread out an emission of particles or radiation according to a property such as mass or energy, and measure the spread.^[7][10]
3. An instrument for measuring the refractive index of a substance from the angles of a prism made of it.^[6][2][3]

Word family

• spectrometric
• spectrometry
• mass spectrometer
• scintillation spectrometer

Related words

• spectroscope
• spectrum

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
5. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
6. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
7. ^ a b c d Merriam-Webster's Collegiate Dictionary (2003), 11th ed., Springfield, Mass.: Merriam-Webster
8. ^ Gove, Philip Babcock, ed. (1961), Webster's Third New International Dictionary of the English Language, Unabridged, Springfield, Mass.: G. & C. Merriam
9. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
10. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins