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Where can I find information on the origin of the phrase "blue blood"?

Last Updated: Mar 28, 2013  |  23 Views

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Oxford English Dictionary is the right reference source that provides the etymology and history of usage. It is available online as a database at

Etymology:  < blue adj.+ blood n., after Spanish sangre azul(1778 or earlier), perhaps alluding to the blue appearance of the veins of people of fair complexion as compared with those of dark skin.

 1. Blood said to characterize old and aristocratic families (originally those of Spain). Hence: noble, aristocratic, or upper-class birth or lineage.

Answered by David Kohut

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