Caustic most commonly refers to:
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Causticity, the property of being able to Chemical burn organic tissue
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Sodium hydroxide, sometimes called caustic soda
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Potassium hydroxide, sometimes called caustic potash
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Calcium oxide, sometimes called caustic lime
Caustic may also refer to:
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Caustic (band), an American industrial/powernoise band
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Caustic (mathematics), the envelope of rays reflected or refracted by a manifold
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Caustic (optics), optic phenomenon due to light rays reflecting/refracting through curved surfaces/objects
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Caustic Graphics, a graphics technology developer, part of Imagination Technologies
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Caustic Window, an alias of Aphex Twin (electronic musician Richard D. James)
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A playable character in the battle royale game Apex Legends