Webster's Revised Unabridged Dictionary · 1913

Mongrel

Mongrel , noun

[Probably shortened from mongrel, and akin to Anglo-Saxon mengan to mix, and English mingle. See Mingle.]

The progeny resulting from a cross between two breeds, as of domestic animals; anything of mixed breed. — Drayton

Mongrel , adjective

1.
(Zoology) Not of a pure breed.
2.
Of mixed kinds; as, mongrel language.