war·ren / ˈwôrən; ˈwä-/ • n. (also rabbit warren) a network of interconnecting rabbit burrows. ∎  a densely populated or labyrinthine building or district: a warren of narrow gas-lit streets. ∎  Brit., hist. an enclosed piece of land set aside for breeding game, esp. rabbits.

War·ren ¹ / ˈwôrən; ˈwär-/ 1. an industrial city in southeastern Michigan, north of Detroit; pop. 138,247.2. an industrial city in northeastern Ohio, on the Mahoning River; pop. 50,793.

warren piece of land preserved for breeding game, esp. for the breeding of rabbits XIV; fig. XVII. — AN., ONF. warenne, var. of (O)F. garenne game-park, now esp. rabbit warren — Gaul. *varrenna area marked off by palisading, f. *varros post (cf. Ir. farr pillar, post).
So warrener (-ER2) officer having charge of a warren. XIV. — AN. warener, ONF. warrennier, (O)F. garennier.

Warren

a place for keeping game animals; a place in the river for keeping fish, 1377.

Examples: warren of conies, 1600; of fish, 1377; of flies, 1625; of hares, 1538; of huts, 1918; of partridge; of passages, 1919; of pheasants; of the poor, 1886; of rats, 1856; a rabbit warren, 1773.