(1):

(superl.) Gray-haired; gray-headed; of a gray color; hoary.

(2):

(superl.) Old; mature; as, gray experience. Ames.

(3):

(n.) A gray color; any mixture of white and black; also, a neutral or whitish tint.

(4):

(n.) An animal or thing of gray color, as a horse, a badger, or a kind of salmon.

(5):

(superl.) White mixed with black, as the color of pepper and salt, or of ashes, or of hair whitened by age; sometimes, a dark mixed color; as, the soft gray eye of a dove.