1. Verb.  (transitive) To make something slightly, or moderately acid; to acidify.
  2. Verb.  (transitive) To make sour in a moderate degree; to sour somewhat.
  3. Verb.  (transitive) To use an acidic catalyst. The chemical change being emphasised over the importance of the change in ph. Used in the processing of biodiesel co-products.

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This entry was last updated on RefTopia from its source on 3/20/2012.