microscope

Etymology

Most dictionaries take it as borrowed from New Latin microscopium (“an instrument for viewing what is small”),^{[2][3][4][5][6]} which Barnhart dates to about 1628.^[7] The OED instead takes the English word as borrowed from Italian microscopio, used by J. Faber in a letter of 1625 printed among Galileo's works, which apparently comes from the post-classical Latin microscopium, a name attributed to Demiscianus in 1614.^[8] The American Heritage Dictionary gives both, the Italian word being itself from the New Latin one.^[9] The Latin word is formed from micro- and -scopium, the ending of telescopium, telescope;^[8][10] the ending is Ancient Greek -σκόπιον (-skópion, “means of viewing”),^[7][6] from σκοπέω (skopéō, “to look at, examine”),^[6][11][7] and micro- is from μικρός (mikrós, “small”).^[2] The word reached other languages in the same century: French microscope is recorded from 1656, German Mikroskopium from 1687 (later Mikroskop) and Spanish microscopio from 1709.^[8]

Earliest recorded meaning

An optical instrument that magnifies very small objects with an arrangement of lenses: 1648, in J. Wilkins's Mathematicall Magick.^[8][10] Barnhart dates the word to 1656,^[7] and Etymonline to the 1650s.^[2]

Semantic evolution

The word was in figurative use almost at once: Milton has it in Paradise Regain'd (1671), and the phrase under the microscope, subject to close scrutiny, comes from this use.^[8][3] Johnson (1755) defined it as an "optick instrument" that gives the eye a large view of objects otherwise invisible, and quoted the Dunciad line on "the critick eye, that microscope of wit".^[11] From about 1741 the name covered devices that project images of small objects,^[8] and since 1907 instruments using radiation of shorter wavelength than light, such as the electron microscope, which give greater magnification than a light microscope.^[8][3] The southern constellation Microscopium was introduced by La Caille in 1752,^[2] and English writers called it the Microscope from 1839.^[8] The verb, to examine minutely or to magnify, is a 19th-century conversion of the noun, first recorded in 1888 in the OED.^[8][3]

Timeline

• 1614 – post-classical Latin microscopium, attributed to Demiscianus.^[8]
• 1625 – Italian microscopio, in a letter of J. Faber.^[8]
• 1648 – English microscope, an optical instrument for viewing very small objects.^[8][10]
• 1656 – date given by Barnhart for the English word; also the first record of French microscope.^[7][8]
• 1671 – figurative use, in Milton's Paradise Regain'd.^[8]
• ?1741 – a device that projects images of very small objects.^[8]
• 1752 – the constellation Microscopium, introduced by La Caille.^[2]
• 1888 – verb, to scrutinize minutely or magnify.^[8]
• 1907 – an instrument using radiation other than visible light.^[8]

Meanings

Noun

1. An optical instrument with a lens or combination of lenses that gives an enlarged image of objects too small to be seen with the naked eye: She examined the leaf cells under a microscope.^[12][10][8]
2. Any instrument that uses radiation other than light, such as electrons or X-rays, to produce a magnified image of a small object.^[12][10][3]
3. under the microscope: under close, critical examination: The council's spending is under the microscope again.^[3][8]
4. the Microscope: the southern constellation Microscopium.^[8][3]

Verb

1. (rare) To examine minutely, as if with a microscope; to magnify.^[10][3][8]

Word family

• photomicroscope
• spectromicroscope
• stereomicroscope
• ultramicroscope
• microscopic
• microscopy
• compound microscope
• electron microscope

Related words

• telescope
• micro-
• -scope
• scope

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
3. ^ a b c d e f g h Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
4. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
5. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
6. ^ a b c Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
7. ^ a b c d e Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
8. ^ a b c d e f g h i j k l m n o p q r s t u Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
9. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
10. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
11. ^ a b Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
12. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins