A reddish brown colour. generally used of horses, and taken to include various shades. Hence qualified as bright-bay, light-bay, blood-bay, golden-bay…

Of a horse: Of a reddish-brown colour. Obsolete. Cf. sorrel, adj. a.

Of horses: = sorrel, adj. a.

Of horses, etc.: = sorrel, adj. a ? Obsolete.

Of a horse: = fallow, adj.1 n.2 (The exact colour denoted by the adjective in early use is uncertain.)

of a particular dark-bay colour (said of a horse).