gray color or pigment.
dirty intermediate tones of gray
a gray thing or animal, in particular a gray or white horse.
Eager equestrians were paraded round the ring by charming chestnuts and graceful greys in the popular horse classes.
the SI unit of the absorbed dose of ionizing radiation, corresponding to one joule per kilogram.
The sievert is numerically equivalent to the gray for electrons and for X-rays irradiating the whole body.