Etymologically

delirus

This is the current revision of this entry, as edited by bogdan on 16 October 2026 at 10:52. This address is a permanent link to this version.

Pronunciation

  • IPA (Classical): [deːˈliː.rʊs][1]
  • IPA (Ecclesiastical): [deˈliː.rus][1]

Forms

dēlīrus (feminine dēlīra, neuter dēlīrum); first/second-declension adjective[1]

Etymology

It is a back-formation from dēlīrō “to be crazy”, literally “to go off the furrow”, from dē- and līra “furrow”.[2][1][3]

Earliest recorded meaning

Köbler's first source is Varro, whom he dates 116–27 BC.[4] Lucretius has dēlīra fātur “says crazy things”.[5]

Semantic evolution

It meant having a deranged mind, crazy, silly, doting, as Lucretius' raving mind, Cicero's doting old man and Horace's madman, and of things senseless, as in Cicero.[2][5][6] Lactantius uses the comparative dēlīrior.[6]

In Medieval Latin it meant deviating, and raving, doting.[7] It survives in Old French deloir.[1] English delirium came in the 1590s from the related noun dēlīrium.[3]

Timeline

  • 116–27 BC – Varro uses it.[4]
  • 96–55 BC – Lucretius uses it of a raving mind.[5][4]
  • 81–43 BC – Cicero uses it of a doting old man.[5][4]
  • 1590s – English delirium is recorded.[3]

Meanings

Adjective

  1. Crazy, insane, doting.[2]
  2. (of things) Senseless.[2]

Word family

References

  1. ^ a b c d e Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  5. ^ a b c d Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  6. ^ a b Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  7. ^ 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