From WordNet (r) 2.0 (August 2003) [wn]:
boar
n 1: Old World wild swine having a narrow body and prominent
tusks from which most domestic swine come; introduced in
United States [syn: wild boar, Sus scrofa]
2: an uncastrated male hog
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Boar \Boar\ (b[=o]r), n. [OE. bar, bor, bore, AS. b[=a]r; akin
to OHG. p[=e]r, MHG. b[=e]r, G. b[aum]r, boar (but not
b[aum]r bear), and perh. Russ. borov' boar.] (Zool.)
The uncastrated male of swine; specifically, the wild hog.
[1913 Webster]