トウ 
 
() hot water () bath
   
(n) (1) hot water, (2) hot bath, hot spring
ゆのみ (n) teacup
ゆげ (n) steam, vapour, vapor
とうじ (n,vs,adj-no) hot-spring cure, taking the baths
ゆわかしき (n) water-heater, water-boiler

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Etymologies: 中文字譜 : 説文解字