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fifth disease

noun
1.
Pathology. a mild infection, most often seen in children or young adults, caused by a small virus ((the human parvovirus B19)) and marked by a blotchy rash on the cheeks, arms, and legs.
Also called erythema infectiosum.
Origin
so called because it was the fifth in a classification scheme of childhood eruptive diseases
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for fifth dis-ease

fifth disease

noun
1.
a mild infectious disease of childhood, caused by a virus, characterized by fever and a red rash spreading from the cheeks to the limbs and trunk Also called slapped-cheek disease Technical name erythema infectiosum
Word Origin
C20: from its being among the five most common childhood infections
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
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fifth dis-ease in Medicine

fifth disease n.
See erythema infectiosum.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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