腎水 is read as じんすい (jinsui) and means semen.
じんすい
jinsui
じんぞう
kidney
じんふぜん
kidney failure
じんえん
nephritis
しおみず
salt water
はいすい
displacement
みず
break granted to wrestlers engaged in a prolonged bout
ぼうすい
waterproofing
こおりみず
ice water
かいすい
seawater
こうすい
perfume
だっすい
evaporation
こうずい
flood