Greatly to my surprise, this is a common word, in the 4,000s of our frequency list.
a. The male of the deer, esp. of the red deer; a stag; spec. a male deer after its fifth year.
- 07.133 Sometimes Bilbo saw the horns of the harts
- 08.030 when the hart bore down on him,
- 08.032 and look for the hart,
- 08.033 a hind and fawns as snowy white as the hart had been dark.
“hart, n.” OED Online. Oxford University Press, June 2016. Web. 28 June 2016.