Illustrated Companion to the Latin Dictionary/Amussium

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. 

AMUS'SIUM. A marble slab, the surface of which was exactly levelled, and proved by the instrument amussis, and upon which the direction of the winds was marked. It was then fixed against the external wall of a house, as a dial, to show the point from which the wind blew. Vitruv. i. 6. 6. Marini, ad l.