外湯 そとゆ Also written そと湯 Meanings Noun open air bath (in an inn, onsen, etc.); external hot spring bath Kanji 外 outside. Read as そと. 湯 hot water. Read as ゆ. Words containing 外湯 外湯めぐり (そとゆめぐり) going from bathhouse to bathhouse (in a hot spring resort) Jinuma: Japanese Dictionary · Word lists