[ pred-nuh-sohn, -zohn ]
/ ˈprɛd nəˌsoʊn, -ˌzoʊn /

noun Pharmacology.

an analogue of cortisone, C21H26O5, used as an anti-inflammatory, immunosuppressive, and antineoplastic in the treatment of various diseases.

Origin of prednisone

1950–55; pre(gna)d(ie)n(e), a component of its chemical name + (cort)isone Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for prednisone

British Dictionary definitions for prednisone


/ (ˈprɛdnɪˌsəʊn) /


a steroid drug derived from cortisone and having the same uses

Word Origin for prednisone

C20: perhaps from pre (gnant) + -d (ie) n (e) + (cort) isone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for prednisone



1955, probably from elements of pregnadiene (from pregnane, name of the compound from which pregnancy hormones were derived, from the Latin stem of pregnancy) + ending from cortisone.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for prednisone


[ prĕdnĭ-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.