E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Calamity.
The beating down of standing corn by wind or storm. The word is derived from the Latin calamus (a stalk of corn). Hence, Cicero calls a storm Calamitosa tempestas (a corn-levelling tempest).
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Another ill accident is drought, and the spoiling of the corn; inasmuch as the word calamity was first derived from calamus (stalk), when the corn could not get out of the ear.Bacon.