caus·tic

[kaw-stik]
adjective
1.
capable of burning, corroding, or destroying living tissue.
2.
severely critical or sarcastic: a caustic remark.
noun
3.
a caustic substance.

Origin:
1350–1400; Middle English < Latin causticus < Greek kaustikós burning, caustic, equivalent to kaust(ós) burnt (verbal adjective of kaíein to burn) + -ikos -ic

caus·ti·cal·ly, caus·tic·ly, adverb
caus·tic·i·ty [kaw-stis-i-tee] , caus·tic·ness, noun
non·caus·tic, adjective
non·caus·ti·cal·ly, adverb
o·ver·caus·tic, adjective
o·ver·caus·ti·cal·ly, adverb
o·ver·caus·tic·i·ty, noun
un·caus·tic, adjective
un·caus·ti·cal·ly, adverb


2. biting, mordant, bitter, scathing, acid.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Caustic is a GRE word you need to know.
So is accolade. Does it mean:
talking or tending to talk much or freely; talkative; chattering; babbling; garrulous:
any award, honor, or laudatory notice:
Collins
World English Dictionary
caustic (ˈkɔːstɪk) [Click for IPA pronunciation guide]
 
adj
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
 
n
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]
 
'caustical
 
adj
 
'caustically
 
adv
 
causticity
 
n
 
'causticness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

caustic
1550s, from O.Fr. caustique, from L. causticus, from Gk. kaustikos "capable of burning," from kaustos "combustible," from kaiein, the Gk. word for "to burn" in all periods, of uncertain origin with no known cognates outside Gk. Figurative sense of "sarcastic" is attested from 1771.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

caustic caus·tic (kô'stĭk)
n.

  1. A hydroxide of a light metal.

  2. A caustic material or substance.

adj.
  1. Capable of burning, corroding, dissolving, or eating away by chemical action.

  2. Of or relating to light emitted from a point source and reflected or refracted from a curved surface.

  3. Causing a burning or stinging sensation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
His caustic and satirical humour expressed itself in a style that astounded
  government departments.
The air smelled caustic and snowed flurrying motes of ash.
The crew then scrubbed the bones and boiled them in a cauldron of water and
  caustic soda to dissolve any remaining flesh.
Green cleaning solutions can keep your toilet as clean as caustic commercial
  products.
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