pred·ni·sone   (prěd'nĭ-sōn',-zōn')    n.  A synthetic steroid, C21H26O5, similar to cortisone that is used as an antiallergic and immunosuppressive drug and as an anti-inflammatory agent in the treatment of rheumatoid arthritis. [pre(gnane), a derivative of cholesterol + d(i-)1 + -(e)n(e) + (cort)isone.]

Main Entry: pred·ni·sone
Pronunciation: 'pred-n&-"sOn also -"zOn
Function: noun
: a glucocorticoidC₂₁H₂₆O₅ that is a dehydrogenated analog of cortisone and is used as an anti-inflammatory agent especially in the treatment of arthritis, as an antineoplastic agent,and as an immunosuppressant

prednisone pred·ni·sone (prěd'nĭ-sōn',-zōn')
n.
A synthetic steroid similar to cortisone that is used as an antiallergic, immunosuppressive, and anticancer drug and as an anti-inflammatory agent in the treatment of rheumatoid arthritis.