A person or device that blanches vegetables or materials; something that makes things pale or white.
From 'blanch' plus the agent noun suffix '-er'. Anyone or anything performing the action of blanching becomes a 'blancher.'
The '-er' suffix is one of English's most productive tools—add it to almost any verb and you get someone or something that does that action, which is why we have everything from 'singers' to 'blanchers.'
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