The Collaborative International Dictionary of English v.0.48:

Mane \Mane\ (m[=a]n), n. [AS. manu; akin to OD. mane, D. maan,
   G. m[aum]hne, OHG. mana, Icel. m["o]n, Dan. & Sw. man, AS.
   mene necklace, Icel. men, L. monile, Gr. ?, ?, Skr. many[=a]
   neck muscles. [root]275.]
   The long and heavy hair growing on the upper side of, or
   about, the neck of some quadrupedal animals, as the horse,
   the lion, etc. See Illust. of Horse.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mane
    n 1: long coarse hair growing from the crest of the animal's
         neck
    2: growth of hair covering the scalp of a human being [syn:
       mane, head of hair]

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "mane":
   bristle, capillament, cilium, coat, crop, fleece, fur, hair, head,
   head of hair, horsehair, locks, mat, mop, pelt, pile, pubescence,
   pubic hair, setula, shag, shock, thatch, tresses, wool