Webster's Revised Unabridged Dictionary · 1913

Agouti

Agouti (ȧ*go"ti) , noun

[French agouti, acouti, Sp. aguti, from native name.]

1.
(Zoology) A rodent of the genus Dasyprocta, about the size of a rabbit, peculiar to South America and the West Indies. The most common species is the Dasyprocta agouti.
2.
the color of the agouti{1}, a grayish-brown of grizzled texture; -- used especially to describe the color of the fur of a strain of mice. Also used attributively.

Also: Agouty