ˈsälədəs noun
( plural soli·di -ˌdī)
Etymology: Middle English, from Late Latin, from Latin solidus solid — more at safe
1. : an ancient Roman gold coin introduced by Constantine as successor to the aureus and used until the fall of the Byzantine Empire
2.
[Medieval Latin solidus shilling, from Late Latin, a gold coin; from its use as a symbol for shillings]
: diagonal 4
3.
a. also solidus curve
[Latin, solid, adjective]
: a curve usually on a temperature-composition diagram for a binary system that corresponds with a liquidus and that indicates temperatures below which only the solid phase can exist
b. also solidus point : the point of temperature at which a substance and especially a metal or alloy is about to melt : incipient melting point