Dictionary
blue blood
Pronunciation: (blOO' blud" for 1; blOO' blud' for 2), [key]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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.