Feeling nauseous or dizzy due to the motion of a ship or boat at sea; suffering from motion sickness while on water.
Compound of 'sea' and 'sick,' formed in Middle English. The medical understanding of why seasickness occurs (inner ear balance disruption) is modern, but the word has existed since people first sailed boats.
Seasickness works on your inner ear's balance system in the same way that spinning around on land does—yet sailors get used to it while landlubbers don't, showing how humans can adapt their brains to nearly anything through exposure.
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