American Heritage Dictionary
(2)
Century Dictionary
(3)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
In these sibylline leaves are gathered the scattered prophecies of the past upon the cases in which the axe will fall.— Free New York Blog
The less comprehensible and more sibylline the sentence uttered, the better.— Faith and Theology
Time and accident are gradually attaching, to the fine instruments in question, a kind of sibylline intensity of value; and the inquiry, if omitted now, may become impossible hereafter.— Notes and Queries, Number 189, June 11, 1853 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc.
If we had newspaper-accounts of the age of Augustus, the chances are that no other epoch in history would be so absolutely problematical, and Augustus himself would be lucky, if he were not resolved into a myth, and the journal into sibylline oracles.— The Atlantic Monthly, Volume 14, No. 83, September, 1864
The sibylline oracles were held in so great veneration among the ancients, that nothing of importance was undertaken without consulting them That divination was used and believed in by the Hebrews, is proved by the Scripture injunctions against divinations.— The Mysteries of All Nations Rise and Progress of Superstition, Laws Against and Trials of Witches, Ancient and Modern Delusions Together With Strange Customs, Fables, and Tales

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 year.
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