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Definition of ryo in US English:

ryo

(also riyo, rio)

noun

  • A former Japanese monetary unit with a standard weight of 4.76 momme (approx. 18 grams), based on a unit of weight of precious metals (varying between 4 and 5 momme).

Origin

Mid 19th century. From Japanese ryō (earlier ryau, riyau) former unit of weight and monetary unit from Middle Chinese.

Pronunciation

ryo

/rɪˈəʊ/