American Heritage Dictionary
(4)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
They're not as satisfying and always make me want to eat more in the hopes that just one more mouthful will be as good as the real thing.— Baking and Books
Now that's another large mouthful, and another large impetus towards abandoning the Washington Consensus and capitalism.
Noonan's Warning, UPDATED w / Noonan's Real Thoughts Peggy Noonan says a mouthful -- and who knows if she actually meant it?— Dad29
If that sounds like a mouthful, it is; I'll try to make it simple, and start off with that last element.— Stars and Stripes

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a week.
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