American Heritage Dictionary
(1)
Century Dictionary
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GNU Webster's 1913
(1)
WordNet
Elsewhere on the web
That ribbing is still common but I stick to my guns - 'h' is 'aitch', not 'haitch' (that is distinctly 'ganwaar' in my book in a stroke of reverse snobbery), 'shai-jool' not 'scke-dool', and 'offen' not 'of-ton'.— WordPress.com News
But I entirely agree with you about 'aitch' and 'shai-jool'.— WordPress.com News
Plain, ordinary aitch-two-oh.— Damned If You Don't

American Heritage 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 year.