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solidus

ソリドゥス　—　Names of money

The gold coin of later Rome. It held its fineness for a long time.

Solidus of Constantine Solidus of ConstantineAD 310–313 Solidus SolidusAD 312– Solidus of Constantine Solidus of Constantine320 AD
A photograph of what this word names.

⚠ In contrast to silver coins, which were continually debased, this gold coin maintained its intrinsic value. This well-preserved gold coin was trusted even outside the country of issue and continued to be used for international payments over a wide area.

The word meaning "solid" became its name.