phos·pho·fruc·to·kinase \¦fäs(ˌ)fōˌfrəktō, -frük-, -fru̇k-ˌ\noun Etymology:phosph- + fructose + kinase : an enzyme that functions in carbohydrate metabolism and especially in glycolysis by catalyzing the transfer of a second phosphate (as from ATP) to fructose