Etymologically

horologium

Etymology and origin of the Latin word horologium

Confidence
Established
Formation
Borrowing
First attested
116–27 BC, Varro
Borrowed from
Ancient Greek ὡρολόγιον
Ultimate origin
Ancient Greek ὡρολόγιον
Etymology tree
inherited borrowed derived
Latin horologium
Italian orologio

Pronunciation

  • Classical: [hoː.rɔˈɫɔ.ɡi.ũː][1]
  • Ecclesiastical: [o.roˈlɔː.d͡ʒi.um][1]

Forms

hōrologium n (genitive hōrologiī or hōrologī); second declension[1] Inscriptions also spell it horilegium, horolegium and orlogium.[2][3]

Etymology

It is borrowed from Ancient Greek ὡρολόγιον (hōrológion, “instrument telling the hour”).[4][5][6] The Greek word is formed from ὥρα (hṓra, “season, hour”) and λέγω (légō, “to say, tell”).[1][6]

Earliest recorded meaning

Köbler and Georges record it first in Varro's On Agriculture,[6][3] and it occurs in Cicero's letters;[5][7] it is an instrument showing the time, either a sundial or a water clock.[4][5]

Semantic evolution

Vitruvius describes the different kinds at length,[3][5] distinguishing the water clock (horologium ex aqua) from the sundial, which Pliny the Elder calls horologium solarium.[3] Seneca and Petronius also use it,[7] and Cassiodorus says that he has provided one worked by the light of the sun.[3]

In Medieval Latin it meant a clock and also a clock tower;[8] British sources use it for the sundial, the water clock and the hourglass.[9] Bede uses it of the sundial.[9] A British record under 1373 states that clocks dividing the day into twenty-four hours were first made that year.[9] In New Latin it is a clock or watch.[1]

Timeline

  • 116–27 BC – Varro uses it.[3][6]
  • 81–43 BC – Cicero mentions one in a letter.[5][7][6]
  • c. 84–c. 25 BC – Vitruvius describes water clocks and sundials.[3][6]
  • AD 218 – An inscription in Germany spells it horolegium.[2]
  • c. 485–c. 580 AD – Cassiodorus mentions a sundial he provided.[3][6]
  • 1373 – A British record notes the first clocks marking twenty-four hours.[9]

Meanings

Noun

  1. An instrument for showing the time: a sundial or a water clock.[4][5]
  2. (Medieval Latin) A clock; an hourglass.[8][9]
  3. (Medieval Latin) A clock tower.[8]
  4. (New Latin) A clock, watch.[1]

Word family

  • hōrologiārius

References

  1. ^ a b c d e f Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  3. ^ a b c d e f g h Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  4. ^ a b c Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  5. ^ a b c d e f Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  6. ^ a b c d e f g Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  7. ^ a b c Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  8. ^ a b c Niermeyer, J. F. (1976), Mediae Latinitatis Lexicon Minus, Leiden: Brill
  9. ^ a b c d e Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press

Borrowed into

Related etymologies

Cite this entry

“Horologium.” Etymologically, 21 Oct. 2026, etymologically.com/la/horologium. Accessed 22 Oct. 2026.

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