Any of a group of compounds (especially creatine phosphate in vertebrate muscle) which contain a phosphate group which can be readily transferred to ADP in order to regenerate ATP as an energy source.
Origin
1920s. From phospha- + -gen.
Definition of phosphagen in US English:
phosphagen
nounˈfɒsfədʒ(ə)n
Biochemistry
Any of a group of compounds (especially creatine phosphate in vertebrate muscle) which contain a phosphate group which can be readily transferred to ADP in order to regenerate ATP as an energy source.