Caustic

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CAUSTIC,
CAUSTICAL, a. Burning; corroding; destroying the texture of animal flesh.
CAUSTIC, n. In medicine, any substance which applied to living animals, acts like fire, in corroding the part and dissolving its texture; an escharotic. [See Causticity.]
Lunar caustic, a preparation of crystals of silver, obtained by solution in nitric acid, and afterwards fused in a crucible. It is a nitrate of silver.
Caustic curve, in geometry, a curve formed by a coincidence of rays of light reflected from another curve.