Etymologically

Etymology and origin of the Latin word raresco

Confidence
Established
Formation
Derivation
First attested
96–55 BC, Lucretius
Ultimate origin
Latin (rārus)
Etymology tree
inherited borrowed derived
Latin rarus
English rare
French rare
Latin raresco

Forms

rārēscō, rārēscere (third conjugation, intransitive; no perfect recorded)[1][2] The OLD prints rārescō.[3] Some later manuscripts spell it rari-.[1]

Etymology

It is from Latin rārus (“loose, sparse, rare”) + -ēscō, an inchoative verb.[3][4][1] De Vaan counts it among the derivatives of rārus, the opposite of dēnsus (“dense”), whose origin is unclear: a link with Proto-Indo-European *h₂erH- (“to disappear, perish”) is not obvious in meaning, and Schrijver rejects every proposal.[5]

Earliest recorded meaning

De Vaan and the OLD record it first in Lucretius,[5][3] who uses it of matter loosening and of clouds thinning out: cum rarescunt quoque nubila caeli, “when the clouds of the sky also thin out”.[4][6]

Semantic evolution

The first meaning is physical: something dense or solid loosens and opens out, as earth under heat in Lucretius,[4][2] or the narrow barriers of Pelorus in Virgil, which will one day open wider.[3][6] Propertius uses it of a sound that grows fainter on a quiet shore.[3][7] It then meant “become sparse”: wool and hair thin out on old animals in Pliny the Elder,[3] and a vineyard grows thin when its trees die in Columella.[3] Statius says the crowded walls of Rome were emptying,[6][7] and Tacitus that hills gradually fall away.[2][6] In later Latin it became more general, “grow rarer, decline”: Tertullian sets iustitia rarescit against iniquitas increbrescit, and Ammianus Marcellinus speaks of poisoners who were becoming rarer.[2] Glossaries explain it as “they become rare or few”.[1]

Timeline

  • 96–55 BC – Lucretius, of clouds and earth thinning out.[3][8]
  • 70–19 BC – Virgil, of a strait opening out.[3][8]
  • 57/46–12 BC – Propertius, of a sound growing fainter.[3][8]
  • 23/24–79 AD – Pliny the Elder, of wool and hair growing sparse.[3][8]
  • c. 160–220 AD – Tertullian, of justice growing rare.[2][8]
  • c. 390 AD – Ammianus Marcellinus, of poisoners becoming fewer.[2][8]

Meanings

Verb

  1. To become less dense or solid, to loosen, thin out; to open out, widen.[3][4]
  2. Of sound, to grow fainter.[3][6]
  3. To become sparse or fewer; of places, to become less crowded; of hills, to fall away.[3][2][6]
  4. (Late Latin) To grow rarer, decline.[2]

Usage notes

Lewis & Short note that it is poetic and post-Augustan prose.[4]

References

  1. ^ a b c d Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  2. ^ a b c d e f g h Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  3. ^ 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
  4. ^ a b c d e Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  5. ^ a b de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  6. ^ a b c d e f Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  7. ^ a b Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  8. ^ a b c d e f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
Cite this entry

“Raresco.” Etymologically, 20 Oct. 2026, etymologically.com/la/raresco. Accessed 20 Oct. 2026.

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