red bone marrow
bone marrow in which the stroma primarily contain the developmental stages of erythrocytes, leukocytes, and megakaryocytes; it is present throughout the skeleton during fetal life and at birth. After the fifth postnatal year, it is gradually replaced in the long bones by yellow marrow.
Synonym(s): medulla ossium rubraTA
Search Stedman's Medical Dictionary
Examples: glitazone, GI cocktail, etc.