1. Unpleasantly sharp, pungent, or bitter to the taste or smell. See Synonyms at bitter.
2. Caustic in language or tone: an acrid political campaign.
[From Latin ācer, sharp (probably modeled on ACID); see ak- in the Appendix of Indo-European roots.]
a·cridi·ty (ə-krĭdĭ-tē), acrid·ness n.
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.