Etymologically

lacertus

Etymology and origin of the Latin word lacertus

Pronunciation

  • IPA (Classical): [ɫaˈkɛr.tʊs][1]
  • IPA (Ecclesiastical): [laˈt͡ʃɛr.tus][1]

Forms

lacertus m (genitive lacertī); second declension[1]

Etymology

The origin is uncertain.[2][1] Pokorny proposed a connection with Ancient Greek λάξ (láx, “with the foot”) and Old Norse leggr (“leg”), and Walde and Hofmann with Ancient Greek λικερτίζειν (likertízein, “to jump, dance”); de Vaan finds none of these semantically convincing.[2][3][4] The TLL suggests that, in the sense “muscle”, it may be the same word as lacertus “lizard” (see lacerta), just as musculus “muscle” is literally “little mouse”.[5][1] Isidore of Seville already explained the muscles as named after small animals hiding under the skin.[5]

Earliest recorded meaning

It is first found in Lucilius, in the late 2nd century BC,[2][6] who mentions a bag tied to the arm.[3]

Semantic evolution

It meant the muscular upper arm, from shoulder to elbow, as opposed to the forearm (bracchium), and more loosely the arm, especially in embraces and in throwing weapons.[3][7] The TLL notes that it was a favourite word of the poets, especially Ovid.[5] In the plural it meant muscles in general, and figuratively strength or “muscle”, as when Cicero speaks of the vigour of an orator's style.[3][8] Ovid uses it once for an arm of a river.[3]

Late Latin used it for a muscle in general.[1]

Timeline

  • c. 180–102 BC – Lucilius uses it for the upper arm.[3][6]
  • 96–55 BC – Lucretius uses it of arms strengthened for throwing.[3][6]
  • 81–43 BC – Cicero uses it for the strength of an orator.[3][6]
  • 43 BC–18 AD – Ovid uses it for the arms in an embrace and for an arm of a river.[3][6]

Meanings

Noun

  1. The upper arm; the arm.[3][7]
  2. (plural) Muscles; figuratively, strength, vigour.[3][8]
  3. An arm (of a river).[3]
  4. (Late Latin) A muscle.[1]

Word family

  • lacertulus
  • lacertōsus
  • lacerta
  • English alligator

Usage notes

A homograph lacertus, a by-form of lacerta, means a lizard and a kind of mackerel.[3][8] Through Spanish el lagarto “the lizard” it is the source of English alligator.[9]

References

  1. ^ a b c d e f g Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ 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
  3. ^ a b c d e f g h i j k l m Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  4. ^ Pokorny, Julius (1959), Indogermanisches etymologisches Wörterbuch, Bern; Munich: Francke
  5. ^ a b c Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  6. ^ a b c d e Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  7. ^ a b Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  8. ^ a b c Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  9. ^ Harper, Douglas, Online Etymology Dictionary, https://www.etymonline.com
Cite this entry

“Lacertus.” Etymologically, 10 Oct. 2026, etymologically.com/la/lacertus. Accessed 10 Oct. 2026.

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