a·cer·bic (ə-sûrbĭk) also a·cerb (ə-sûrb)
2. Sharp or biting, as in character or expression: "At times, the playwright allows an acerbic tone to pierce through otherwise arid or flowery prose" (Alvin Klein).
[From Latin acerbus; see ak- in the Appendix of Indo-European roots.]
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