superabsorbent polymer; high polymer absorbent
Technical term used in chemistry and materials science for polymers that can absorb and retain large amounts of liquid relative to their own mass.
Superabsorbent polymers are used in disposable diapers.
Compound of 高分子 (kōbunshi, 'polymer') + 吸収 (kyūshū, 'absorption') + 体 (tai, 'body, substance').