[pred-nuh-sohn, -zohn]
noun Pharmacology.
an analogue of cortisone, C 2 1 H 2 6 O 5 , used as an anti-inflammatory, immunosuppressive, and antineoplastic in the treatment of various diseases.

1950–55; pre(gna)d(ie)n(e), a component of its chemical name + (cort)isone Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prednisone (ˈprɛdnɪˌsəʊn)
a steroid drug derived from cortisone and having the same uses
[C20: perhaps from pre(gnant) + -d(ie)n(e) + (cort)isone]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

prednisone pred·ni·sone (prěd'nĭ-sōn',-zōn')
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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Anabolic steroids are not the same as prednisone prescribed by physicians for
  inflammatory and other disorders.
The first therapy tried is usually a steroid medication, such as prednisone.
Prednisone or other corticosteroid medications help reduce the inflammation.
Adults are usually started on an anti-inflammatory steroid medicine called
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