Where did this term "chunk" come from?

Professor Fate said
And just think of poor Weiand- they had to put the pronunciation right on their manifolds because nobody could get it right...
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I was gonna mention Wee-and, in connection with Elderbrock.
I called my new pumpkin/chunk/chuck a center (or center section) when I ordered it,and show it off. Lighter, but I'm still gonna get help from my friend Jack