morning sickness

noun
nausea occurring in the early part of the day, especially as a characteristic symptom in the first months of pregnancy.

Origin:
1875–80

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
morning sickness
 
n
nausea occurring shortly after rising: an early symptom of pregnancy

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

morning sickness n.
Nausea and vomiting upon rising in the morning, especially during early pregnancy. Also called nausea gravidarum.

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
Bring extra sick bags and sanitary wipes if you are suffering from morning
  sickness.
Morning sickness and dry heaves made her too nauseated to crave cigarettes.
If you have morning sickness during pregnancy, ask your doctor about the many
  possible treatments.
Morning sickness usually tapers off by the second trimester.
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