Caus‐tic″i‐ly (?), n. 1. The quality of being caustic; corrosiveness; as, the causticity of potash.
2. Severity of language; sarcasm; as, the causticity of a reply or remark.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.