Blood  —n. 1 usu. Red fluid circulating in the arteries and veins of animals. 2 bloodshed, esp. Killing. 3 passion, temperament. 4 race, descent, parentage (of the same blood). 5 relationship; relations (blood is thicker than water). 6 dandy. —v. 1 give (a hound) a first taste of blood. 2 initiate (a person).  in one's blood inherent in one's character. [old english]