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From Pre-Latin *lukrom, dissimilated from Proto-Italic *luklom, from Proto-Indo-European *lh₂utlom, from Proto-Indo-European *leh₂w- (“profit, gain”) + *-tlom (“suffix denoting a tool”). Cognate with Ancient Greek ἀπολαύω (apolaúō, “to enjoy”), λείᾱ (leíā), Sanskrit लोत्र (lotra, “booty”), German Lohn (“reward, wages”), Gothic 𐌻𐌰𐌿𐌽 (laun).

lucrum n (genitive lucrī); second declension

Second-declension noun (neuter).

Insular Romance:
- Sardinian: lúcru, lúcuru
Balkano-Romance:
- Aromanian: lucru (“thing”), lucuru
- Romanian: lucru (“thing, work”)
- Megleno-Romanian: lucru (“thing”)
Italo-Dalmatian:
- Italian: logoro (“squandering”)
- Sicilian: lucru
Southern Gallo-Romance:
- Catalan: llogre
Ibero-Romance:
- Galician: logro (“profit”)
- Portuguese: logro (“deceit”)
- Spanish: logro (“success”)
Borrowings:
- → Albanian: lukër (“sheep”)
Learned borrowings:
- → Catalan: lucre
- → English: lucre
- → Esperanto: lukri
- → French: lucre
- → Italian: lucro
- → Occitan: lucre
- → Portuguese: lucro
- → Spanish: lucro

“lucrum”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
“lucrum”, in Charlton T. Lewis (1891), An Elementary Latin Dictionary, New York: Harper & Brothers
"lucrum", in Charles du Fresne du Cange, Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
“lucrum”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.
Carl Meißner; Henry William Auden (1894), Latin Phrase-Book‎, London: Macmillan and Co.
- to suffer loss, harm, damage.[2: damnum (opp. lucrum) facere
- to make profit out of a thing: lucrum facere (opp. damnum facere) ex aliqua re
- to consider a thing as profit: in lucro ponere aliquid (Flacc. 17. 40)
Meyer-Lübke, Wilhelm (1911), “lŭcrum”, in Romanisches etymologisches Wörterbuch (in German), page 371

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