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fifth disease

[fifth di-zeez]
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.
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Origin of fifth disease

so called because it was the fifth in a classification scheme of childhood eruptive diseases
Also called er·y·the·ma in·fec·ti·o·sum [er-uh-thee-muh in-fek-shee-oh-suh m] /ˌɛr əˈθi mə ɪnˌfɛk ʃiˈoʊ səm/
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for erythema infectiosum

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 trunkAlso called: slapped-cheek disease Technical name: erythema infectiosum
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Word Origin for fifth disease

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

erythema infectiosum in Medicine

erythema infectiosum

(ĭn-fĕk′shē-ōsəm)
n.
  1. A mild infectious disease occurring mainly in early childhood, marked by a rosy-red maculopapular rash on the cheeks, often spreading to the trunk and limbs. Fever and arthritis may also be present.fifth disease
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fifth disease

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