Webster's English Dictionary

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caustic

caus.tic \'ko.-stik\ \-sti-k*l\ \-sti-k(*-)le-\ \ko.-'stis-*t-e-\ aj [L 
   causticus, fr. Gk kaustikos, fr. kaiein to burn; akin to L]ith kule` smut 
   of plants 1: capable of destroying or eating away by chemical action : 
   CORROSIV E 2: SHARP, INCISIVE {~ wit}  3: relating to or being the envelope 
   of rays emanating from a point and re flected or refracted by a curved 
   surface - caustic n