Definition of purer:
(adj) :
Free of flaws or imperfections; unsullied.
(adj) :
Free of foreign material or pollutants.
(adj) :
Free of immoral behavior or qualities; clean.
(n) :
One who, or that which, is pure.
(adj) :
Mere; that and that only.
(adj) :
(of a branch of science) Done for its own sake instead of serving another branch of science.