CAUSTICAL

\kˈɔːstɪkə͡l], \kˈɔːstɪkə‍l], \k_ˈɔː_s_t_ɪ_k_əl]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1790 - A Complete Dictionary of the English Language
By Thomas Sheridan