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sol·i·dus (sŏĺĭ-dəs)

[Middle English, from Late Latin (nummus) solidus, a solid (sesterce), from Latin solidus, solid; see solid.]

noun: pl., -di (-dī́) 

  1. A gold coin of the Roman Empire used in Europe until the 15th century. Also called bezant
  2. Printing A virgule; a slash.