American Heritage Dictionary
(4)
Century Dictionary
(10)
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
I'll also nominate Pierce R. Butler solely for use of the word "equinoctial."— Planet Atheism
As long as a portion are rich and a portion are poor, there is a line of demarcation easy to be drawn, even in a democracy; but in Philadelphia, where there are so many in affluent circumstances, that line has been effaced, and they now seek an imaginary one, like the equinoctial, which none can be permitted to pass without going through the ceremonies of perfect ablution.— Diary in America, Series One
Although lying in the powerful current of the Gulf Stream, which is a propelling force speeding forward the vessel that trusts its warm, blue waters, this route is exposed to the most violent cyclonic storms, and navigators shun and evade it during the equinoctial or hurricane season.— Lippincott's Magazine of Popular Literature and Science Volume 11, No. 24, March, 1873
But I've no sympathy with chickens who will be born just in time for the equinoctial I didn't want them," said Dorothy, anxious to defend her management.— Stories by American Authors (Volume 4)
That on the north side of the equinoctial is called the tropic of Cancer, because the sun describes it when in that sign of the ecliptic; and that on the south side is, for a similar reason, called the tropic of Capricorn.— The Metamorphoses of Ovid Vol. I, Books I-VII

American Heritage Dictionary (1)
Century Dictionary (1)
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