morning sickness

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Nausea and vomiting upon rising in the morning, especially during early pregnancy.

from The Century Dictionary.

• noun Nausea and sometimes vomiting from which a woman often suffers at the beginning of pregnancy, in the early part of the day.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun medicine Early morning nausea and vomiting as a symptom of pregnancy.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun nausea early in the day; a characteristic symptom in the early months of pregnancy