Etymology and origin of the Latin word lac
- Confidence
- Established
- Formation
- Inherited
- First attested
- c. 250–184 BC, Plautus
- Inherited from
- Proto-Italic *glagt-
- Ultimate origin
- Proto-Indo-European (*glg-t-)
Forms
lac n (genitive lactis); third declension[1] The nominative and accusative is also lacte, in Ennius, Plautus and Cato, and lact in Varro and Pliny.[2][3][4] Apuleius has a masculine accusative lactem.[4]
Etymology
It is inherited from Proto-Italic *glagt- (“milk”), inherited from Proto-Indo-European *glg-t- (“milk”).[3][1] Cognate with Ancient Greek γάλα (gála, “milk”), genitive γάλακτος (gálaktos), and Old Armenian կաթն (katʿn, “milk”).[3][2] De Vaan explains the Latin loss of the initial ⟨g-⟩ by dissimilation, and rejects both Leumann's view that the word was borrowed from Greek and Sihler's reconstruction with an initial ⟨*dl-⟩.[3]
Earliest recorded meaning
De Vaan gives Plautus as its first author;[3] in the Truculentus the nurse needs milk (lact), and Ennius has the cheek that blushed “like milk mixed with purple”.[2]
Semantic evolution
It is milk, and a type of whiteness, as in Ennius.[2][1] It was proverbial for likeness: in Plautus no water is more like water nor milk more like milk than one twin is like the other.[2] By likeness it is the milky juice of plants, as Varro's milk of the fig branch, and the spawn of oysters (Pliny the Elder).[2]
Church Latin glosses it “milk”.[5] English lactic (1790) comes through French from its genitive ⟨lactis⟩.[6]
Timeline
- c. 250–184 BC – Plautus of a nurse's milk and of twins as like as milk.[2][3][7]
- 204–169 BC – Ennius of milk-white skin.[2][7]
- 116–27 BC – Varro of the milky juice of the fig.[2][7]
- 23/24–79 AD – Pliny the Elder of oyster spawn.[2][7]
- 1790 – English lactic.[6]
Meanings
Noun
- Milk, (poetic) milk-white colour.[2][1][4]
- The milky juice of plants.[2][1]
- The spawn (of oysters).[2]
Word family
- collactāneus
- lactāneus
- lactāris
- lactārius
- lactātum
- lacteō
- lacteolus
- lactēscō
- lacteus
- lacticīnium
- lactifer
- lactineus
Related words
- dēlicus
- lactō
- English lactic
Usage notes
Tam similis quam lacte lactī, “as like as milk to milk”, was the Latin for “as like as two peas”.[2]
References
- ^ a b c d e f g Wiktionary, the free dictionary, https://en.wiktionary.org
- ^ a b c d e f g h i j k l m n Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
- ^ a b c d e f de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
- ^ a b c Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
- ^ Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
- ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
- ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
Related etymologies
- opus · also from Proto-Indo-European
- albus · also from Proto-Indo-European
- potis · also from Proto-Indo-European
- salvus · also from Proto-Indo-European
- socius · also from Proto-Indo-European
- signum · also from Proto-Indo-European
- frater · also from Proto-Indo-European
- foedus · also from Proto-Indo-European
Cite this entry
“Lac.” Etymologically, 19 Oct. 2026, etymologically.com/la/lac. Accessed 19 Oct. 2026.
Last edited on . ·