sol·i·dus 
(sŏlĭ-dəs)
(sŏlĭ-dəs)n. pl. sol·i·di (-dī′)
1. A gold coin of the Roman Empire used in Europe until the 1400s. Also called bezant.
2. Printing A virgule; a slash.
3. Chemistry The maximum temperature at which all components of a mixture, such as an alloy, can be in a solid state.
[Middle English, from Late Latin (nummus) solidus, a solid (sesterce), from Latin solidus, solid; see SOLID.]