'As mad as a March Hare' definitions:

Definition of 'As mad as a March Hare'

From: GCIDE

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. [1913 Webster]
The stormy March is come at last, With wind, and cloud, and changing skies. --Bryant. [1913 Webster]
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. [1913 Webster]