D defs.my
Entry 2 senses Webster, 1913

Blue blood

/(blū"blŭd`)/ · IPA
01 n. a member of the nobility or aristocracy, or a person of high social status.
  1. 1.
    a member of the nobility or aristocracy, or a person of high social status.
  2. 2.
    the quality of status that qualifies one as a blue blood; -- used metaphorically, as “They have blue blood in their veins.”. See: blue blood