To treat grain or flour with agene chemical compound to bleach and mature it.
From agene + -ize (to make or treat with); created as a technical verb for the industrial process of applying agene to flour.
The verb 'agenize' peaked in use during the 1930s-1950s as a standard bakery process, then nearly disappeared from English when the chemical fell out of favor—a rare example of a technical verb becoming obsolete.
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