pred·ni·sone 
(prĕdnĭ-sōn′,-zōn′)
(prĕdnĭ-sōn′,-zōn′)n.
A synthetic corticosteroid, C21H26O5, derived from cortisone and used as an antiallergy, immunosuppressive, and anti-inflammatory drug.
[pre(gnane), a steroid (from PREGNANT1) + D(I-)1 + -(E)N(E) + (CORT)ISONE.]
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