A hind is an adult female deer.
In everyday language, we often use "hind" when talking about wild deer or elk. For example, if you're on a hike and see a big group of deer grazing in the meadow, someone might say, "Look at that large hind with its fawn." This usually means they're pointing out an adult female deer who's probably been born already and has had her baby.
Located at the rear (most often said of animals' body parts).
