noun
Refers to water that is cold, often with a nuance of winter or chilly conditions. Not a common everyday word; 冷たい水 is more typical in daily speech.
寒水で顔を洗うと、目が覚める。
Washing your face with cold water wakes you up.
noun
water in midwinter
Specifically water during the coldest part of winter, often used in poetic or literary descriptions. Rare in modern conversation.
真冬の寒水は、まるで刃物のように冷たい。
The water in midwinter is as cold as a blade.