Open English Wordnet
(n)ion-exchange polymer, ion-exchange resinAn ion-exchange resin or ion-exchange polymer is an insoluble matrix (or support structure) normally in the form of small (0.5-1 mm diameter) beads, usually white or yellowish, fabricated from an organic polymer substrate.“Sodium polystyrene sulfonate is a strongly acidic ion-exchange resin and is used to treat hyperkalemia.”