Word Study
protagon
CIDE DICTIONARY
protagon, n. [Proto- + Gr. 'agw`n a contest. See. Protagonist. So called because it was the first definitely ascertained principle of the brain.].
A nitrogenous phosphorized principle found in brain tissue. By decomposition it yields neurine, fatty acids, and other bodies. [1913 Webster]
For further exploring for "protagon" in Webster Dictionary Online
