any of various tan to dark-brown bears (Ursus arctos), found in Europe, North America, etc., including the grizzly bear and Kodiak bear
See brown bear in American Heritage Dictionary 4
noun
Any of several large bears of the genus Ursus, such as the grizzly and Kodiak bears, inhabiting western North America and northern Eurasia and having brown to yellowish fur. Brown bears are sometimes categorized as the single species U. arctos.