Protagon

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Protagon \Pro"ta*gon\, n. [Proto- + Gr. 'agw`n a contest. See.
     {Protagonist}. So called because it was the first definitely
     ascertained principle of the brain.] (Physiol. Chem.)
     A nitrogenous phosphorized principle found in brain tissue.
     By decomposition it yields neurine, fatty acids, and other
     bodies.


     [1913 Webster]