A doe is a deer, a female deer. Doe can also refer to the female of other animals, but it’s usually a deer. You might spot a doe in the spring, walking through the woods with her babies.
There are several four-legged mammals whose females are called does, including goats, antelopes, and even rabbits. The males are called bucks. The words doe and buck are like woman and man for the furry set. Oddly, you can also refer to female guinea pigs, mice, and weasels as does, although doe usually means a deer. The word comes from the Old English da, or "female deer," which probably stems from a Celtic root.