Dictionary for Young People: Compact Disk, a.k.a. "CD" (n.)

A circular prism with a donut hole, generally glued to the axle of a clear plastic case that always breaks at the hinge, sized to allow for placement on a special-purpose cup holder that can be pushed into an inner sanctum where elves who live inside operate a special juicer that can extract the implanted sounds after making eight seconds of mechanical noise.