Etymologically

Etymology and origin of the Latin word aquilus

Confidence
Probable
Formation
Derivation
First attested
c. 250–184 BC, Plautus
Ultimate origin
Latin aqua
Etymology tree
inherited borrowed derived
Latin aqua
French eau
Italian acqua
Latin aquilus
From the same root
Latin aquarius ← aqua
Latin aquor ← aqua
Latin aquosus ← aqua

Pronunciation

  • Classical: [ˈa.kʷɪ.ɫʊs][1]
  • Ecclesiastical: [ˈaː.kʷi.lus][1]

Forms

aquilus (feminine aquila, neuter aquilum); first/second-declension adjective[1]

Etymology

The origin is uncertain.[2][3] The OLD and de Vaan take it as probably from Latin aqua (“water”), as the Romans did;[4][5] de Vaan prefers this to a derivation from aquila (“eagle”), proposed by Cohen.[5] Wiktionary adds that Ernout and Meillet rejected the link with water and that Pokorny relates aquilō (“the north wind”) as well.[1]

Earliest recorded meaning

Its first author is Plautus, who describes someone corpore aquilō, “with a dark body”.[4][3][5]

Semantic evolution

It was always a rare word.[3] Lucilius has it,[4] and the Festus excerpts define the colour as dusky and blackish.[4][3] Suetonius describes a complexion inter aquilum candidumque, “between dark and fair”, Apuleius uses it of a dark column of low clouds, and Arnobius of boys.[4][6] Martianus Capella applies it to the gods of death and the underworld.[6]

Medieval glossaries render it by Old English brūn.[7] By confusion with aquila it could also mean hooked like an eagle's beak, of a nose, and by confusion with aquilō northern.[8]

Timeline

  • c. 250–184 BC – Plautus uses it of a dark body.[4][7]
  • c. 75–c. 150 AD – Suetonius uses it of a complexion.[4][7]
  • c. 125–175 AD – Apuleius uses it of dark clouds.[4][7]

Meanings

Adjective

  1. Dark-coloured, dusky, swarthy.[4][3][9]
  2. (Medieval Latin) Hooked like an eagle's beak, aquiline;[8][7] (by error) northern.[8][7]

Word family

  • subaquilus

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  3. ^ a b c d e Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  4. ^ a b c d e f g h i Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  5. ^ a b c de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  6. ^ a b Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  7. ^ a b c d e f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  8. ^ a b c Mittellateinisches Wörterbuch bis zum ausgehenden 13. Jahrhundert (1967–), Munich: C. H. Beck; Bayerische Akademie der Wissenschaften
  9. ^ Simpson, D. P. (1959), Cassell's New Latin Dictionary, London: Cassell
Cite this entry

“Aquilus.” Etymologically, 23 Oct. 2026, etymologically.com/la/aquilus. Accessed 23 Oct. 2026.

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