The Collaborative International Dictionary of English v.0.48:

March \March\ (m[aum]rch), n. [L. Martius mensis Mars'month fr.
   Martius belonging to Mars, the god of war: cf. F. mars. Cf.
   Martial.]
   The third month of the year, containing thirty-one days.
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         The stormy March is come at last,
         With wind, and cloud, and changing skies. --Bryant.
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   As mad as a March Hare, an old English Saying derived from
      the fact that March is the rutting time of hares, when
      they are excitable and violent. --Wright.
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