Sentence:  In an attempt to reverse the downhill trend by stimulating the <WSD>bone</WSD> marrow and controlling any hemolytic component , triamcinolone , 16 mg. daily , was begun on Sept. 26 , 1958 , and continued until Feb. 18 , 1959 . 
Meaning of the word marked with <WSD> tags:  the fatty network of connective tissue that fills the cavities of bones