Maculae meaning : 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. A small chamber of the inner ear of certain vertebrates filled with endolymph and containing an otolith. A spot, as on the skin, or on the surface of the sun or of some other luminous orb. A rather large spot or blotch of color. In planetary geology, an unusually dark area on the surface of a planet or moon.