(idiomatic) let the water carry it away, wipe the slate clean

water warmed in the sun

(smoking) a hookah; a waterpipe

(history) a 律令 (ritsuryō) position in the 後宮 (Kōkyū, “Seraglio”) that manages water and ice

(history) a 律令 (ritsuryō) position in the 後宮 (Kōkyū, “Seraglio”) that manages water and ice / Alternative spelling of 主水司

the Wei River

spirogyra

(chemistry) hydration (incorporation of water molecules into another compound)

subterranean river / water from a subterranean river

"the grass is always greener on the other side": The others' circumstances seem more desirable.