Source : WordNet®

transfer RNA
     n : short-chain RNA molecules present in the cell (in at least
         20 varieties, each variety capable of combining with a
         specific amino acid) that attach the correct amino acid
         to the protein chain that is being synthesized at the
         ribosome of the cell (according to directions coded in
         the mRNA) [syn: {tRNA}, {acceptor RNA}, {soluble RNA}]