Illustrated Companion to the Latin Dictionary/Tholus

This article incorporates text from a publication now in the public domain: Rich, Anthony (1849). The illustrated companion to the Latin dictionary, and Greek lexicon. p. vi. OCLC 894670115. https://archive.org/details/illustratedcompa00rich. 

THOL'US (θόλος). A cupola or dome for roofing over any circular building (Vitruv. iv. 8. 7. Ov. Fast. vi. 282.); applied both to the interior, or ceiling formed within it (Ov. Fast. vi. 296. Virg. Aen. ix. 408.), and to the exterior, or outside roof. (Mart. ii. 59.) The illustration (Tholus/1.1), from a medal of Nero, establishes the genuine meaning of the term; for it represents the great market for ready-dressed provisions (macellum magnum), which, we learn from Varro (ap. Non. p. 448.), was covered by a cupola (tholum macelli), as here represented.

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  Tholus/1.1