noun: (organic chemistry) Initialism of tetrahydrofuran. [(organic chemistry) A heterocyclic ether having a five-membered ring with four carbon atoms and one oxygen; it is a colourless liquid with an ether-like smell, and is used as a polar solvent.]
noun: (biochemistry) Initialism of tetrahydrofolate. [(biochemistry) The conjugate base of, or any salt or ester of, tetrahydrofolic acid; it is a coenzyme, formed by reduction of folic acid, involved in the biosynthesis of purines.]
