|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|1.||capable of burning or corroding by chemical action: caustic soda|
|2.||sarcastic; cutting: a caustic reply|
|3.||of, relating to, or denoting light that is reflected or refracted by a curved surface|
|4.||Also called: caustic surface a surface that envelops the light rays reflected or refracted by a curved surface|
|5.||Also called: caustic curve a curve formed by the intersection of a caustic surface with a plane|
|6.||chem a caustic substance, esp an alkali|
|[C14: from Latin causticus, from Greek kaustikos, from kaiein to burn]|
caustic caus·tic (kô'stĭk)
A hydroxide of a light metal.
A caustic material or substance.
Capable of burning, corroding, dissolving, or eating away by chemical action.
Of or relating to light emitted from a point source and reflected or refracted from a curved surface.
Causing a burning or stinging sensation.