grizzle adj.

"gray in color," late 14c., griseld, a past-participle adjective formation from the noun grizzle "gray-haired old man" (early 14c. as a surname, Grissel); see grizzle (adj.). Or else from Old French grisel "gray," diminutive of gris "gray," from a Frankish or other Germanic source (such as Old High German gris "gray;" see gray (adj.). The -zz- spelling is early 15c. As a verb, grizzle "to grow gray; to make gray" is not attested before 18c.

"somewhat gray," 1590s, from grizzle "gray-colored" + -y (1). Also see grizzled. Grizzly bear (ursus horribilis) for the large ferocious bear of the western U.S., is recorded by 1806; sometimes said to belong rather to grisly (q.v.), but either adjective suits it.