What does blue blood mean?

blue blood meaning in General Dictionary

a member of this nobility or aristocracy or people of high personal condition

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  • an associate for the aristocracy

blue blood meaning in Etymology Dictionary

1809 in mention of the the blood that flows within the veins of old and aristocratic categories of Spain, translating Spanish sangre azul, advertised by certain groups of Castile as uncontaminated by Moorish or Jewish admixture; the term might be from the thought associated with the visible veins of men and women of reasonable complexion. In mention of the English households by 1827. As a noun, "member of a classic and aristocratic household," by 1877.