Source : Webster's Revised Unabridged Dictionary (1913)

Wheal \Wheal\, n. [Cornish hwel.] (Mining)
   A mine.

Wheal \Wheal\, n. [OE. whele, AS. hwele putrefaction, hwelian to
   putrefy.]
   A pustule; a whelk. --Wiseman.

Wheal \Wheal\, n. [Cf. {Wale}.]
   1. A more or less elongated mark raised by a stroke; also, a
      similar mark made by any cause; a weal; a wale.

   2. Specifically (Med.), a flat, burning or itching eminence
      on the skin, such as is produced by a mosquito bite, or in
      urticaria.

Source : WordNet®

wheal
     n : a raised mark on the skin (as produced by the blow of a
         whip); characteristic of many allergic reactions [syn: {wale},
          {welt}, {weal}]