Real Dictionary

blood in American English
the usually red fluid, consisting of plasma, red and white blood cells, etc., that circulates through the heart, arteries, and veins of vertebrates: blood is a body tissue that carries oxygen, hormones, cell-building material, etc. to, and carbon dioxide
noun: the fluid that circulates in the principal vascular system of human beings and other vertebrates, in humans consisting of plasma in which the red blood cells, white blood cells, and platelets are suspended

blood in British English
noun: a reddish fluid in vertebrates that is pumped by the heart through the arteries and veins, supplies tissues with nutrients, oxygen, etc, and removes waste products. It consists of a fluid (see blood plasma) containing cells (erythrocytes, leucocytes, and
noun: Thomas, known as Colonel Blood. ?1618–80, Irish adventurer, who tried to steal the crown jewels (1671)