morning sickness

WordReference Random House Learner's Dictionary of American English © 2025

ˈmorn•ing ˌsick•ness, n. [uncountable]

1. Medicine nausea occurring esp. in the early part of the day during the first months of pregnancy.

WordReference Random House Unabridged Dictionary of American English © 2025

morn′ing sick′ness, 

1. Physiology nausea occurring in the early part of the day, esp. as a characteristic symptom in the first months of pregnancy.

• 1875–80

Collins Concise English Dictionary © HarperCollins Publishers::

morning sickness noun

1. nausea occurring shortly after rising: an early symptom of pregnancy