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Containing excessive acid; excessively acidic: a hyperacid stomach.

hy′per·a·cid′i·ty (-ə-sĭd′ĭ-tē) n.
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On April 13th two intense eruptions occurred within the hyperacid lake which ejected blocks and sediments that reached a minimum radius of 2 km surrounding the active crater.
The impact of the hyperacid Ijen Crater lake: risks of excess fluoride to human health.