What is piratical disease?

Piratical refers to a pirate, one who steals and plunders valuables from aboard a ship not commissioned by a government. A piratical disease would be an illness associated with pirates such as scurvy. Scurvy is caused by a lack of vitamin C, and being at sea for long periods of time made it difficult to keep things like fresh fruit available, which would have helped stave off scurvy.

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Monday, February 06 2012
Source: http://www.thefreedictionary.com/piratical