Source : Webster's Revised Unabridged Dictionary (1913)

Macula \Mac"u*la\, n.; pl. {Macul[ae]}. [L., spot, stain, blot.
   See {Mail} armor, and cf. {Mackle}, {Macule}.]
   1. A spot, as on the skin, or on the surface of the sun or of
      some other luminous orb.

   2. (Zo["o]l.) A rather large spot or blotch of color.

Source : WordNet®

macula
     n 1: a cooler darker spot appearing periodically on the sun's
          photosphere; associated with a strong magnetic field
          [syn: {sunspot}]
     2: a yellowish central area of the retina that is rich in cones
        and that mediates clear detailed vision [syn: {macula
        lutea}, {macular area}, {yellow spot}]
     3: a patch of skin that is discolored but not usually elevated;
        caused by various diseases [syn: {macule}]
     [also: {maculae} (pl)]

maculae
     See {macula}