From The Collaborative International Dictionary of English v.0.48:

Equinox \E"qui*nox\, n. [OE. equinoxium, equenoxium, L.
   aequinoctium; aequus equal + nox, noctis, night: cf. F.
   ['e]quinoxe. See Equal, and Night.]
   1. The time when the sun enters one of the equinoctial
      points, that is, about March 21 and September 22. See
      Autumnal equinox, Vernal equinox, under Autumnal and
      [1913 Webster]

            When descends on the Atlantic
            The gigantic
            Stormwind of the equinox.             --Longfellow.
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   2. Equinoctial wind or storm. [R.] --Dryden.
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