Etymologically

Etymology and origin of the Romanian word ac

Confidence
Established
Formation
Inherited
First attested
1508 a Slavonic-language document More words from the 16th century
Inherited from
Latin acus
Ultimate origin
Latin acus
Etymology tree
inherited borrowed derived
Latin acus
Italian ago
Romanian ac
Derivations
From the same root
Latin acia ← acus
Latin aculeus ← acus

Pronunciation

Forms

ac n (plural ace)[1] In the Moldovan Cyrillic alphabet the word was written ак.[1]

Etymology

It is inherited from Latin acus (“needle”).[2][3][4][1][5][6] It survives in all four branches: Aromanian ac, Megleno-Romanian ac and Istro-Romanian åc.[2][3][7][8][9] Its cognates are Dalmatian yuak, Italian ago, Sardinian agu and Occitan ac.[2][6] The Latin noun was feminine and of the fourth declension; it passed into the second, and so became masculine in Italian and Romanian, while Dalmatian and Sardinian kept the feminine.[10] French and Spanish replaced it with derivatives, French aiguille and Spanish aguja.[10][11] DELR links the Latin word with ācer (“sharp”), aciēs (“edge”) and acidus,[3] and Wiktionary traces it to Proto-Indo-European *h₂eḱ- (“sharp”).[1]

The railway sense “switch, points” is modelled on the same French word and on German Nadel.[3][10]

Earliest recorded meaning

DELR's first record is from 1508, in the Slavonic-language documents of the Romanian principalities.[3] In Romanian texts the word appears in Coresi's prints: MDA2 dates it to 1564,[4] and in a text by Coresi of 1580 the camel cannot pass „preîn urechile acului” “through the eye of the needle”.[10][12]

Semantic evolution

From the sewing needle the word was applied to things of the same shape: the hand of a clock or instrument, a pin, the needle of a conifer and the sting of a bee or wasp.[2][3][13] The DA groups the sting and sharp stabbing pains with the needle.[10] The railway sense “switch, points” came in the 19th century, after French and German;[3] the pointsman was then called acar, recorded from 1901.[3][2]

The family includes a needle box, acăriță (1825) or acarniță (1839), and the old adjective acos “sharp, stinging” (1682).[3] Many idioms use the word: a scăpa ca prin urechile acului “to have a narrow escape” and a avea ac de cojocul cuiva “to know how to deal with someone”.[13][4]

Timeline

  • 1508 – first record, in a Slavonic-language document.[3]
  • 1564 – in a print by Coresi.[4]
  • 1580 – urechile acului “the eye of the needle” in a text by Coresi.[10]
  • c. 1650 – the augmentative acoi.[3]
  • 1682 – acos “sharp, stinging” in Dosoftei.[3]
  • 1691–1697 – the diminutive acușor in Teodor Corbea's dictionary.[3]
  • 1825 – acăriță “needle box” in the Lexicon of Buda.[3]
  • 1839 – acarniță “needle box” and aculeț.[3]
  • 1901 – acar “pointsman”.[3]

Meanings

Noun

  1. A needle: a small, thin steel tool with a point at one end and an eye at the other, for sewing.[13]
  2. Any similar pointed piece: a pin, a knitting needle, the needle of a syringe or a gramophone.[13][4]
  3. The hand or pointer of a clock or measuring instrument.[13][2]
  4. The narrow pointed leaf of a conifer.[13][3]
  5. The sting or sharp organ of some animals and plants.[13][2]
  6. (railways) A railway switch, the movable rail of points.[3][10]

Word family

  • acar
  • acarniță
  • acăriță
  • aculeț
  • acușor

Usage notes

The plural is ace.[13] Curbă în ac de păr “hairpin bend” is a recent phrase, after English hairpin.[14]

References

  1. ^ a b c d e Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g Ciorănescu, Alexandru (1958–1966), Diccionario etimológico rumano, La Laguna: Universidad de La Laguna (Romanian ed.: Dicționarul etimologic al limbii române, București: Saeculum, 2001), p. s.v. ac
  3. ^ a b c d e f g h i j k l m n o p q r Academia Română, Institutul de Lingvistică „Iorgu Iordan – Al. Rosetti” (2011–), Dicționarul etimologic al limbii române (DELR), vol. I: A–B (2011), vol. II: C (2015–2018), București: Editura Academiei Române; continued online at delr.lingv.ro, p. s.v. ac
  4. ^ a b c d e Academia Română, Institutul de Lingvistică „Iorgu Iordan – Al. Rosetti” (2010), Micul dicționar academic, 2nd ed., 4 vols., București: Univers Enciclopedic Gold, p. 1, 5
  5. ^ Pușcariu, Sextil (1905), Etymologisches Wörterbuch der rumänischen Sprache I: Lateinisches Element, Heidelberg: Carl Winter, p. 1
  6. ^ a b Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter, p. 130
  7. ^ Papahagi, Tache (1963), Dicționarul dialectului aromân, general și etimologic, București: Editura Academiei Republicii Populare Romîne, p. 51
  8. ^ Capidan, Theodor (1935), Meglenoromânii III: Dicționar meglenoromân, București: Academia Română, p. 7
  9. ^ Kovačec, August (1998), Istrorumunjsko-hrvatski rječnik (s gramatikom i tekstovima), Pula
  10. ^ a b c d e f g Academia Română (1913–1949), Dicționarul limbii române (DA), ed. Sextil Pușcariu, tom I (A–B, C, D–De) and tom II (F–I, J–Lojniță), București: Socec / Universul / Monitorul Oficial și Imprimeriile Statului; page scans at cflr-scans.solirom.ro, p. s.v. ac
  11. ^ Nocentini, Alberto; Parenti, Alessandro (2010), l'Etimologico: vocabolario della lingua italiana, Firenze: Le Monnier, p. s.v. ago
  12. ^ Tiktin, Hariton (2000–2005), Rumänisch-deutsches Wörterbuch, 3rd ed., revised by Paul Miron and Elsa Lüder, 3 vols., Cluj-Napoca: Clusium, p. s.v. ac
  13. ^ a b c d e f g h DEX (2009), Dicționarul explicativ al limbii române [Explanatory dictionary of the Romanian language], Bucharest: Editura Univers Enciclopedic, p. 4
  14. ^ Dimitrescu, Florica (1997), Dicționar de cuvinte recente, 2nd ed., București: Logos (with the 3rd ed., 2013, in CLRE), p. s.v. ac

Related etymologies

  • apă · also from Latin
  • bun · also from Latin
  • unde · also from Latin
  • veni · also from Latin
  • noi · also from Latin
  • bine · also from Latin
  • un · also from Latin
  • și · also from Latin
Cite this entry

“Ac.” Etymologically, 11 Nov. 2026, etymologically.com/ro/ac. Accessed 12 Nov. 2026.

Last edited on . ·