messenger RNA

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The form of RNA that mediates the transfer of genetic information from the cell nucleus to ribosomes in the cytoplasm, where it serves as a template for protein synthesis. It is synthesized from a DNA template during the process of transcription.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biochemistry RNA that encodes and carries information from DNA during transcription to sites of protein synthesis to undergo translation in order to yield a protein.