1. Capable of destroying the texture of anything or eating away its substance by chemical action; burning; corrosive; searing.
2. Severe; satirical; sharp; as, a caustic remark.
(Optics), a curve to which the ray of light, reflected or refracted by another curve, are tangents, the reflecting or refracting curve and the luminous point being in one plane.
See under Lime.
(Chem.), the solid hydroxides potash, KOH, and soda, NaOH, or solutions of the same.
nitrate of silver, lunar caustic.
(Optics), a surface to which rays reflected or refracted by another surface are tangents. Caustic curves and surfaces are called catacaustic when formed by reflection, and diacaustic when formed by refraction.
Syn. -- Stinging; cutting; pungent; searching.