vitriolic

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, similar to, or derived from a vitriol.
• adjective Bitterly scathing; caustic.

from The Century Dictionary.

• Of or pertaining to vitriol; having the properties of vitriol, or obtained from vitriol.
• Biting; caustic; very severe or censorious.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Chem.) Of or pertaining to vitriol; derived from, or resembling, vitriol; vitriolous. Cf. vitriol.
• adjective Biting, bitter or caustic; having or expressing strong and unpleasantly negative feelings; -- of speech or feelings.
• adjective (Old Chem.), [Colloq.] sulphuric acid. See Vitriol (b).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective of, derived from, or similar to a vitriol
• adjective bitterly scathing; caustic: vitriolic criticism
• adjective chemistry : Of or pertaining to vitriol; derived from, or resembling, vitriol; vitriolous; as, a vitriolic taste.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective harsh or corrosive in tone
• adjective of a substance, especially a strong acid; capable of destroying or eating away by chemical action