nausea occurring in the early part of the day, especially as a characteristic symptom in the first months of pregnancy.
Origin of morning sickness
First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
nausea occurring shortly after rising: an early symptom of pregnancy
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
Nausea and vomiting upon rising in the morning, especially during early pregnancy.nausea gravidarum
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.