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blue blood

[bloo bluhd for 1; bloo bluhd for 2] /ˈblu ˌblʌd for 1; ˈblu ˈblʌd for 2/
noun
1.
an aristocrat, noble, or member of a socially prominent family.
2.
aristocratic, noble, or socially prominent lineage or relatives:
They boasted a lineage of pure blue blood.
Origin
1825-1835
1825-35; translation of Spanish sangre azul. See sanguine, azure
Related forms
blue-blooded, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for blue-blood

blue blood

noun
1.
royal or aristocratic descent
Derived Forms
blue-blooded, adjective
Word Origin
C19: translation of Spanish sangre azul
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for blue-blood

blue blood

1834, translating Spanish sangre azul, claimed by certain families of Castile as uncontaminated by Moorish or Jewish admixture, probably from the notion of the visible veins of people of fair complexion.

Online Etymology Dictionary, © 2010 Douglas Harper
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6
9
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