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Wiktionary
transfer rna

n. (context biochemistry English) A short-chain version of RNA that transfers individual amino acids to ribosomes during protein synthesis.

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]

Wikipedia
Transfer RNA

A transfer RNA (abbreviated tRNA and formerly referred to as sRNA, for soluble RNA) is an adaptor molecule composed of RNA, typically 76 to 90 nucleotides in length, that serves as the physical link between the mRNA and the amino acid sequence of proteins. It does this by carrying an amino acid to the protein synthetic machinery of a cell ( ribosome) as directed by a three-nucleotide sequence ( codon) in a messenger RNA (mRNA). As such, tRNAs are a necessary component of translation, the biological synthesis of new proteins according to the genetic code.