A picture receiver is a device that captures and displays images. The term 'picture receiver' can refer to a variety of devices, such as a television, computer monitor, or digital camera. In this case, the crossword solution for the term 'picture receiver' is 'RETINA, ' which is the light-sensitive layer of tissue at the back of the eye that receives and processes visual information. The RETINA is responsible for converting light into electrical signals that are sent to the brain, allowing us to see.