Source : Webster's Revised Unabridged Dictionary (1913)

Bald \Bald\, a. [OE. balled, ballid, perh. the p. p. of ball to
   reduce to the roundness or smoothness of a ball, by removing
   hair. [root]85. But cf. W. bali whiteness in a horse's
   forehead.]
   1. Destitute of the natural or common covering on the head or
      top, as of hair, feathers, foliage, trees, etc.; as, a
      bald head; a bald oak.

            On the bald top of an eminence.       --Wordsworth.

   2. Destitute of ornament; unadorned; bare; literal.

            In the preface to his own bald translation.
                                                  --Dryden.

   3. Undisguised. `` Bald egotism.'' --Lowell.

   4. Destitute of dignity or value; paltry; mean. [Obs.]

   5. (Bot.) Destitute of a beard or awn; as, bald wheat.

   6. (Zo["o]l.)
      (a) Destitute of the natural covering.
      (b) Marked with a white spot on the head; bald-faced.

   {Bald buzzard} (Zo["o]l.), the fishhawk or osprey.

   {Bald coot} (Zo["o]l.), a name of the European coot ({Fulica
      atra}), alluding to the bare patch on the front of the
      head.

Source : WordNet®

bald
     adj 1: with no effort to conceal; "a barefaced lie" [syn: {barefaced}]
     2: without the natural or usual covering; "a bald spot on the
        lawn"; "bare hills" [syn: {bare}, {denuded}, {denudate}]
     3: lacking hair on all or most of the scalp; "a bald pate"; "a
        bald-headed gentleman" [syn: {bald-headed}, {bald-pated}]

bald
     v : grow bald; lose hair on one's head; "He is balding already"