Definition of lunar caustic in English:

lunar caustic

Syllabification: lu·nar caus·tic

noun

Chemistry , • archaic
  • Silver nitrate, especially fused in the form of a stick.
    More 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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Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody