solidus
Concise Oxford English Dictionary © 2008 Oxford University Press:
solidus /ˈsɒlɪdəs/
▶noun (pl. solidi /-dʌɪ/)
- 1 chiefly Brit. another term for slash (sense 3 of the noun).
- 2 Chemistry a curve in a graph of the temperature and composition of a mixture, below which the substance is entirely solid.
- 3 historical a gold coin of the later Roman Empire.
– origin L., lit. ‘solid’; sense 3 is from L. solidus (nummus).
'solidus' also found in these Oxford entries:

