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solarium

Etymology and origin of the Latin word solarium

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solarium1 sundial; terrace

Confidence
Established
Formation
Derivation
First attested
Plautus
Ultimate origin
Latin (sōl)

Pronunciation

  • IPA (Classical): [soːˈɫaː.ri.ũː][1]
  • IPA (Ecclesiastical): [soˈlaː.ri.um][1]

Forms

sōlārium n (genitive sōlāriī or sōlārī); second declension[1]

Etymology

This noun is from sōl “sun” with the suffix -ārium.[2][1][3]

Earliest recorded meaning

The OLD's earliest citation is from Plautus, of a sunny terrace.[2] Köbler dates Plautus c. 250–184 BC.[4]

Semantic evolution

It meant a sundial, as in Varro, who says it was the thing on which the hours were seen in the sun, and other timepieces such as a water clock.[2][5] The sundial in the Forum was a meeting place, and Cicero has ad sōlārium versārī “to hang about the sundial”.[5] In Plautus and Suetonius it meant a part of a house open to the sun, a balcony or terrace.[2]

Köbler traces Old English solor and German Söller “loft, balcony” to it.[4] It survives in Italian solaio “floor, loft”, and English took solarium for a sundial in 1842 and for a sun room in 1891.[1][3]

Timeline

  • c. 250–184 BC – Plautus uses it of a terrace.[2][4]
  • 116–27 BC – Varro uses it of a sundial.[2][4]
  • 1842 – English solarium “sundial” is recorded.[3]

Meanings

Noun

  1. A sundial; a water clock.[2]
  2. A balcony, terrace.[2]

solarium2 ground rent

Confidence
Established
Formation
Derivation
First attested
Ulpian
Ultimate origin
Latin (solum)

Pronunciation

  • IPA (Classical): [soːˈɫaː.ri.ũː][1]
  • IPA (Ecclesiastical): [soˈlaː.ri.um][1]

Forms

sōlārium n (genitive sōlāriī or sōlārī); second declension[1]

Etymology

This noun is from solum “ground” with the suffix -ārium, understood with ⟨vectīgal⟩ “tax”.[2][6][5]

Earliest recorded meaning

Köbler's first source is Ulpian, whom he dates before 223 AD.[4]

Semantic evolution

It meant a ground rent, a tax on land, in the Digest and inscriptions.[2][6][5]

Timeline

  • before 223 AD – Ulpian uses it.[4]

Meanings

Noun

  1. A ground rent.[2]

References

  1. ^ a b c d e f g h Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ a b c d e f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  5. ^ a b c d Gaffiot, Félix (2016), Dictionnaire latin-français, new ed. by Gérard Gréco et al. (Gaffiot 2016), online ed.
  6. ^ a b Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
Cite this entry

“Solarium.” Etymologically, 16 Oct. 2026, etymologically.com/la/solarium. Accessed 17 Oct. 2026.

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