cold drinking water; glass of cold water
Polite term used mainly in restaurants or when asking for cold water. Often served as a complimentary drink.
Excuse me, could I have some cold water, please?
cold boiled rice
Rare, old-fashioned term for cold cooked rice. Modern Japanese usually uses 冷やご飯 or 冷ご飯.
In the old days, lunch was sometimes just cold rice with pickles.
Would you like a refill of cold water?
Variant with okurigana や; less common but still seen.
Polite prefix お + 冷 (cold). The reading ひや is a noun form of 冷える (to get cold).