warren: [14] A warren is etymologically a ‘fenced-off’ area. The word was acquired from warenne, the Anglo-Norman version of Old French garenne ‘game-park’. This in turn came from Gaulish *varrenna ‘area bounded by a fence’, which was derived from *varros ‘post’. The specific link with rabbits (originally as a reserve set aside for breeding rabbits, now an area where wild rabbits live) is a secondary development. [warren etymology, warren origin, 英语词源]