Definition of lunar caustic in English:

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lunar caustic

noun

[mass noun] Chemistry , archaic
Silver nitrate, especially fused in the form of a stick.
Example sentences
  • For a long time in the treatment of places to be cauterized, only the dreaded nitrate of lunar caustic was used to produce the caustic effect.
  • At the time with which we are concerned lunar caustic was used as an astringent, in medicine and for cosmetic purposes, and for marking linen.

Origin

Early 19th century: lunar in the sense 'containing silver'.

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