The Collaborative International Dictionary of English v.0.48:

Hart \Hart\ (h[aum]rt), n. [OE. hart, hert, heort, AS. heort,
   heorot; akin to D. hert, OHG. hiruz, hirz, G. hirsch, Icel.
   hj["o]rtr, Dan. & Sw. hjort, L. cervus, and prob. to Gr.
   kerao`s horned, ke`ras horn. [root]230. See Horn.] (Zool.)
   A stag; the male of the red deer. See the Note under Buck.
   [1913 Webster]

         Goodliest of all the forest, hart and hind. --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Hart
    n 1: United States playwright who collaborated with George S.
         Kaufman (1904-1961) [syn: Hart, Moss Hart]
    2: United States lyricist who collaborated with Richard Rodgers
       (1895-1943) [syn: Hart, Lorenz Hart, Lorenz Milton
       Hart]
    3: a male deer, especially an adult male red deer [syn: hart,
       stag]