Source : Webster's Revised Unabridged Dictionary (1913)

Thar \Thar\, n. (Zo["o]l.)
   A goatlike animal ({Capra Jemlaica}) native of the Himalayas.
   It has small, flattened horns, curved directly backward. The
   hair of the neck, shoulders, and chest of the male is very
   long, reaching to the knees. Called also {serow}, and {imo}.
   [Written also {thaar}, and {tahr}.]

Thar \Thar\, v. impersonal, pres. [OE. thar, [thorn]arf, AS.
   [thorn]earf, infin. [thorn]urfan to need; akin to OHG.
   durfan, G. d["u]rfen to be allowed, Icel. [thorn]urfa to
   need, Goth. [thorn]a['u]rban.]
   It needs; need. [Obs.] --Piers Plowman.

         What thar thee reck or care?             --Chaucer.