noun
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.
すみません、お冷をください。
Excuse me, could I have some cold water, please?
お冷のおかわりはいかがですか。
Would you like a refill of cold water?
noun
cold boiled rice
Rare, old-fashioned term for cold cooked rice. Modern Japanese usually uses 冷やご飯 or 冷ご飯.
昔はお冷に漬物だけの昼食もあった。
In the old days, lunch was sometimes just cold rice with pickles.
Modern standard term for cold cooked rice. お冷 in this sense is rare and old-fashioned.
Polite prefix お + 冷 (cold). The reading ひや is a noun form of 冷える (to get cold).