Etymologically

leo

Etymology and origin of the Latin word leo

Confidence
Established
Formation
Borrowing
First attested
Naevius
Borrowed from
Ancient Greek λέων
Ultimate origin
Ancient Greek (λέων)
Etymology tree
inherited borrowed derived
Ancient Greek λέων
Ancient Greek χαμαιλέων
English chameleon
Latin chamaeleon
English leopard
Latin leo
Latin leopardus

Pronunciation

  • IPA (Classical): [ˈɫe.oː][1]
  • IPA (Ecclesiastical): [ˈlɛː.o][1]

Forms

leō m (genitive leōnis); third declension[1]

Etymology

It is borrowed from Ancient Greek λέων (léōn, “lion”).[2][1][3] Köbler and Etymonline note that the Greek word may itself come from a Semitic language, comparing Akkadian labbu (“lion”) and Hebrew ⟨lavi⟩.[4][3]

Earliest recorded meaning

The OLD's earliest citation is from Naevius, of the animal.[2] Köbler dates Naevius c. 235–200 BC.[4]

Semantic evolution

It meant a lion, and Lucretius calls it validus and Ovid fulvus “tawny” and magnanimus.[2][5] In Cicero it was the constellation and zodiac sign Leo, in Pliny the Elder a kind of crab, in Columella a plant name, and in inscriptions a grade of initiate in the cult of Mithras, and Tertullian speaks of the Leōnēs Mithrae.[2][5]

British Medieval Latin used it for the lion, in the phrase in ōre leōnis “in the lion's mouth” for great danger, and as a type of vices and virtues.[6] It survives in Italian leone, Spanish león and Romanian leu, and through Old French lion it gave English lion in the late 12th century.[1][3] French dent de lion “lion's tooth” gave English dandelion in the late 14th century.[3]

Timeline

  • c. 235–200 BC – Naevius uses it.[2][4]
  • 81–43 BC – Cicero uses it of the constellation.[2][4]
  • c. 160–220 AD – Tertullian mentions the Leōnēs of Mithras.[5][4]
  • late 12th century – English lion is recorded.[3]

Meanings

Noun

  1. A lion.[2]
  2. The constellation and zodiac sign Leo.[2]
  3. A kind of crab.[2]
  4. A grade of initiate in Mithraism.[2]

Word family

  • leōnīnus
  • leonteus
  • leunculus

Usage notes

Lewis & Short also list a verb leō “to smear”, given by Priscian as the root of dēleō.[5]

References

  1. ^ a b c d e Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b c d e 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. ^ 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

Derived terms

Related etymologies

Cite this entry

“Leo.” Etymologically, 16 Oct. 2026, etymologically.com/la/leo. Accessed 16 Oct. 2026.

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