eyespot
eye.spot \'i--.spa:t\ n 1: a simple visual organ or pigment or pigmented cells covering a sensory t ermination 2: a spot of color
 Webster's English Dictionary
 Webster's English Dictionaryeye.spot \'i--.spa:t\ n 1: a simple visual organ or pigment or pigmented cells covering a sensory t ermination 2: a spot of color