polyacid

https://doi.org/10.1351/goldbook.PT07217
In polymer terminology, polyelectrolyte composed of macromolecules containing acid groups on a substantial fraction of the constitutional units.
Note: Most commonly, the acid groups are $\ce{–COOH}$, $\ce{–SO3H}$, or $\ce{–PO3H2}$.
Source:
PAC, 2006, 78, 2067. (Terminology of polymers containing ionizable or ionic groups and of polymers containing ions (IUPAC Recommendations 2006)) on page 2072 [Terms] [Paper]