Illustrated Companion to the Latin Dictionary/Plinthium

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. 

PLIN'THIUM (πλινθίον). A sun-dial described upon a flat slab, laid horizontally, like a plinth. Vitruv. ix. 8.