caustic

Capable of burning, corroding or destroying organic tissue.

Sharp, bitter, cutting, biting, and sarcastic in a scathing way.

"How now!" said Scrooge, caustic and cold as ever.

The bargain was not concluded as easily as might have been expected though, for Scadder was caustic and ill-humoured, and cast much unnecessary opposition in the way

Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic.

The association of the heavenly bodies with known metals and also with human organs and destinies goes back to ancient Chaldea, the land of astrologers. In Chaucer’s words: ‘The seven bodies eek, lo hear anon. Sol gold is, and Luna silver we declare; Mars yron, Mercurie is quyksilver; Saturnian leed; and Jubitur is tyn, and Venus coper, by my fathers kyn.’ […] Corresponding names were bestowed upon salts of these metals by the alchemists, and some of them have persisted down to the present day. Some examples are lunar caustic (silver nitrate); vitriol of Venus (copper sulphate); sugar of Saturn (lead acetate); and vitriol of Mars, or Martial vitriol (ferrous sulphate).

The envelope of reflected or refracted rays of light for a given surface or object.

The envelope of reflected or refracted rays for a given curve.

Caustic soda.