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Etymology and origin of the English word nit

Pronunciation

nit1 louse egg

Confidence
Established
Formation
Inherited
First attested
c. 700 Épinal Glossary
Inherited from
Old English hnitu via Middle English
Ultimate origin
Proto-Indo-European *ḱnid-

Etymology

The louse egg is inherited from Middle English nite, also nete and nitte,[2][3][4] inherited from Old English hnitu,[5][6][3][7][8] from Proto-Germanic *hnits.[6][3][9] It is cognate with Middle Dutch nete, Dutch neet, Middle Low German nēte, Old High German niz and German Nisse.[5][3][7][10] The OED notes that these West Germanic forms lack the g- of the North Germanic words from the same base, Old Norse gnit, Swedish gnet and Danish gnid.[5] Outside Germanic it is related to Ancient Greek κονίς (konís), Middle Irish sned, Welsh nedd, Czech knida, Polish gnida, Latvian gnīda and Albanian thëri (“louse”),[5][6][3][11][10] from Proto-Indo-European *ḱnid-.[3][9][6] Klein thinks the Greek word stood for an older form without the vowel and was influenced in form by the Greek word for dust;[11] Partridge connects the root with a Greek word for the nettle and a sense "to sting".[12]

Earliest recorded meaning

The egg of a louse: in the early Old English Épinal Glossary,[5] which Barnhart dates to about 700.[3] Old English glossaries render Latin words for nits with hnitu, and a medical text gives a cure to remove nits and worms from children.[8] The Middle English nete is recorded about 1350.[3][2]

Semantic evolution

In Middle English the word could also mean a young louse, and even a gnawing worm or a skin disease.[2] From 1547 it was used of a gnat or other small fly, a sense now regional in the United States.[5][13] By Shakespeare's day a nit stood for anything small or insignificant:[14] in Love's Labour's Lost (1598) "a most pathetical nit" is a contemptible person, and the word later came to mean chiefly a foolish or stupid one.[5][15] Green's Dictionary of Slang thinks the point was the creature's insignificance rather than its being vermin.[15] Merriam-Webster Unabridged and Dictionary.com instead take nit, a fool, as a shortening of nitwit, dated about 1903 by Merriam-Webster;[4][16] Etymonline dates nitwit to 1914 and derives its first part from a nit meaning nothing.[6] The phrase as dead as a nit is recorded from 1789.[5] A short-lived verb nit, to pore carefully over a book, was used from 1596 to 1602, after the close attention needed to clear something of nits.[5][13] The idea of searching hair for nits gave nitpicker (1951), nitpicking (1956) and the verb nit-pick (1962),[6][3][14] which in turn gave to pick nits (1978) and nit for a minor fault or quibble (1982).[5][4] In English dialects the word was in general use for the egg of a louse and for a louse, with neet in parts of Scotland.[17]

Timeline

  • c. 700 – the egg of a louse, as Old English hnitu.[5][3]
  • c. 1350 – Middle English nete.[3][2]
  • 1547 – a gnat or other small fly.[5]
  • 1596 – verb, to pore carefully over a book (obsolete by 1602).[5]
  • 1598 – an insignificant or contemptible person, later a fool.[5][15] Merriam-Webster Unabridged dates the sense "nitwit" to about 1903.[4]
  • 1789 – as dead as a nit.[5]
  • 1978 – to pick nits, to nitpick.[5]
  • 1982 – a minor fault or quibble.[5]

Meanings

Noun

  1. The egg of a louse or other parasitic insect, especially of a head louse when stuck to a hair: The nurse checked every child for nits.[5][18][4][19]
  2. The young of such an insect.[4][18][19]
  3. (chiefly British, informal) A foolish or stupid person; a nitwit.[4][5][15]
  4. (informal) A minor fault or shortcoming; a quibble.[4][5]

Word family

  • nitty
  • nitpicking
  • nitpicker
  • nitpick

nit2 unit of luminance

Confidence
Established
Formation
Borrowing
First attested
1953 J. W. T. Walsh, Photometry
Borrowed from
French nit
Ultimate origin
Latin niteō

Etymology

The unit of luminance is borrowed from French nit, formally adopted in 1948 by the International Commission on Illumination,[5] from Latin niteō (“to shine”).[5][20] The American Heritage Dictionary and Dictionary.com take it from nitor (“brightness”), a noun from the same verb.[19][16]

Earliest recorded meaning

A unit of luminance: 1953, in the second edition of J. W. T. Walsh's Photometry.[5] Dictionary.com dates the word to 1950–55.[16]

Timeline

  • 1953 – a unit of luminance equal to one candela per square metre.[5][20]

Meanings

Noun

  1. (physics) A unit of luminance equal to one candela per square metre.[5][20][19]
  • nitwit
  • nitid

Usage notes

Several minor words share the spelling.[5][4] In Australia to keep nit is to keep watch, recorded from 1883, and nit! is a warning that someone is coming (1898); the OED thinks it perhaps a variant of nix, while Merriam-Webster Unabridged and the Shorter Oxford call it of unknown origin.[5][4][20] The Word Origins dictionary describes children shouting it when a teacher approaches.[14] A related Australian slang verb nit, to decamp or hurry away, is recorded from 1882.[5][20][15] American slang nit, no or not (1894), is probably from Dutch or southern German, or perhaps from Yiddish.[5][4] In Scotland nit is also a nut, especially a hazelnut.[4][17]

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d Kurath, Hans; Kuhn, Sherman M.; Lewis, Robert E., eds. (1952–2001), Middle English Dictionary, Ann Arbor: University of Michigan Press; online edition ed. Frances McSparran et al. (2000–2018)
  3. ^ a b c d e f g h i j k Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  4. ^ a b c d e f g h i j k l Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  5. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z 27 28 29 Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  6. ^ a b c d e f Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  7. ^ a b Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  8. ^ a b Bosworth, Joseph; Toller, T. Northcote (1898), An Anglo-Saxon Dictionary, Oxford: Clarendon Press; Toller, T. Northcote (1921), Supplement
  9. ^ a b Köbler, Gerhard (2014), Germanisches Wörterbuch, 5th ed., online, koeblergerhard.de/wikiling
  10. ^ a b Holthausen, Ferdinand (1934), Altenglisches etymologisches Wörterbuch, Heidelberg: Carl Winter
  11. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  12. ^ Partridge, Eric (1966), Origins: A Short Etymological Dictionary of Modern English, 4th ed., London: Routledge & Kegan Paul
  13. ^ a b Kay, Christian; Roberts, Jane; Samuels, Michael; Wotherspoon, Irené, eds. (2009), Historical Thesaurus of the Oxford English Dictionary, Oxford: Oxford University Press; online edition (2024)
  14. ^ a b c Cresswell, Julia (2021), Oxford Dictionary of Word Origins, 3rd ed., Oxford: Oxford University Press
  15. ^ a b c d e Green, Jonathon (2010), Green's Dictionary of Slang, London: Chambers; digital ed. 2016–, https://greensdictofslang.com
  16. ^ a b c Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  17. ^ a b Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)
  18. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins
  19. ^ a b c d The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  20. ^ a b c d e Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press

Related etymologies

Cite this entry

“Nit.” Etymologically, 2 Nov. 2026, etymologically.com/en/nit. Accessed 2 Nov. 2026.

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