From Middle English warenne, from Anglo-Norman and Old Northern French warenne, from Old French guarenne, garenne, probably from a Germanic *warinne "game park", from the root *war- of Proto-Germanic *warjaną (“ward off, defend against”) (cf. also Old French warir, guarir, a borrowing from this Germanic root). Alternatively the Old French may have derived from a Gaulish varenna (“enclosed area”), related to varros (“post”). 
warren (plural warrens)
- The system of burrows where rabbits live.
- (figuratively) A mazelike place of dark alleys etc in which it's easy to lose oneself; especially one that may be overcrowded.
- A heart-shaped hoe.
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- Plural form of war