Etymologically

Etymology and origin of the Latin word adaperio

Confidence
Established
Formation
Derivation
First attested
116–27 BC, Varro
Ultimate origin
Latin (aperiō)
Etymology tree
inherited borrowed derived
Latin aperio
Latin adaperio

Pronunciation

  • Classical: [a.daˈpɛ.ri.oː][1]
  • Ecclesiastical: [a.daˈpɛː.ri.o][1]

Forms

adaperiō (present infinitive adaperīre, perfect active adaperuī, supine adapertum); fourth conjugation[1]

Etymology

It is from Latin ad- + aperiō (“to open, uncover”).[2][1][3] Lewis and Short take the prefix as intensive.[4] De Vaan traces the simple verb to Proto-Italic *ap-wer-je- (“to open”), from Proto-Indo-European *h₂(e)p (“off”) and *h₂u̯er-i(e/o)- (“to cover”); its opposite is operiō “to cover”.[5]

Earliest recorded meaning

The OLD's earliest example is in Varro, who lists among the signs of fever in animals an open mouth with moist breath (adapertum ōs).[2][3][6]

Semantic evolution

It means to open wide, as a door, gate or mouth, and Lewis and Short note that Cicero does not use it.[2][4] Livy has attackers fall on gates thrown open and a tunnel opened up;[2][4] Seneca opens a book;[2][4] Curtius speaks of a king's ears opened to the slanders of the envious.[2][4] In medical writing it was used of loosening the bowels and of opening a vein,[2] and it could mean to uncover or bare, as the head, or to reveal to view and to knowledge.[2][7]

Timeline

  • 116–27 BC – Varro uses it of the open mouth of a feverish animal.[2][8]
  • 59 BC–17 AD – Livy uses it of gates and of a mine broken open.[2][4][8]
  • 14–37 AD – Celsus uses it in medical senses.[2][8]
  • 4 BC–65 AD – Seneca uses it of opening a book.[2][8]
  • c. 45–96 AD – Statius uses it of the truth being revealed.[2][8]

Meanings

Verb

  1. To open wide, throw open (a door, the mouth); to unroll a book.[2][4]
  2. (figurative) To open (the ears) to information.[2]
  3. To break open;[2] (medicine) to loosen (the bowels).[2]
  4. To make by opening, open up (a vein).[2]
  5. To uncover, bare, expose to view; to reveal.[2][7]

Word family

  • adapertilis
  • adapertiō
  • sēmiadapertus
  • adapertus

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p q r s Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  4. ^ a b c d e f g Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  5. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  6. ^ Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  7. ^ a b Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  8. ^ a b c d e Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
Cite this entry

“Adaperio.” Etymologically, 20 Oct. 2026, etymologically.com/la/adaperio. Accessed 21 Oct. 2026.

Last edited on . ·