transfer RNA (tRNA)
A single-stranded RNA molecule containing about 70-90 nucleotides, folded by intrastrand base pairing into a characteristic secondary ('cloverleaf') structure that carries a specific amino acid and matches it to its corresponding codon on an mRNA during protein synthesis.
PAC, 1992, 64, 143. 'Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)' on page 167 (