1. (a.) Of a yellowish or reddish brown color; as, a sorrel horse.

2. (n.) A yellowish or reddish brown color.

3. (n.) One of various plants having a sour juice; especially, a plant of the genus Rumex, as Rumex Acetosa, Rumex Acetosella, etc.

bay bayard beige brown brownish brownish-yellow brunet buckskin calico pony chestnut chocolate cinnamon cocoa cocoa-brown coffee coffee-brown dapple-gray drab dun dun-brown dun-drab ecru fawn fawn-colored fuscous gray grege grizzle hazel khaki lurid nut-brown olive-brown olive-drab paint painted pony piebald pinto roan seal seal-brown sepia skewbald snuff-colored tan taupe tawny toast toast-brown umber umber-colored walnut walnut-brown yellowish-brown