Meaning of “grey” - Learner’s Dictionary

grey

noun [ C, U ] UK US gray us uk /ɡreɪ/
Her dark hair is now tinged with grey.His dark hair was lightly streaked with grey.He was dressed in muted shades of grey and brown.I don't wear much grey.I've decided to paint the office grey.

A2 a colour that is a mixture of black and white

(Definition of “grey noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)