D defs.my
Entry 2 senses Webster, 1913

Causticily

· Caus·tic·i·ly · IPA
01 n. The quality of being caustic; corrosiveness; as, the causticity of potash.
  1. 1.
    The quality of being caustic; corrosiveness; as, the causticity of potash.
  2. 2.
    Severity of language; sarcasm; as, the causticity of a reply or remark.