Definitions for "Non-coding DNA"
DNA that does not code for a protein.  Not all DNA codes for proteins.  Some DNA between genes is needed to help the genetic machinery express the genes.  DNA also contains segments that are repeated many times.
One of the two identical strands that make up the DNA double helix. The non-coding strand, or antisense strand, is a mirror-image of the coding strand, but does not carry the information needed to order the production of proteins.
The strand of DNA that does not carry the information necessary to make a protein. The non-coding strand is the mirror image of the coding strand and is also known as the antisense strand.