macula

noun5

1. •
   A spot, as on the skin, or on the surface of the sun or of some other luminous orb.
2. •
   An oval yellow spot near the center of the retina of the human eye, histologically defined as having two or more layers of ganglion cells, responsible for detailed central vision.
3. •
   A rather large spot or blotch of color.
4. •
   In planetary geology, an unusually dark area on the surface of a planet or moon.
5. •
   A small chamber of the inner ear of certain vertebrates filled with endolymph and containing an otolith.