The sick feeling in your stomach that makes you feel like you might vomit. It can be caused by illness, motion, strong smells, or strong emotions.
From Latin 'nausea' meaning 'seasickness', from Greek 'nausia' or 'nautia', from 'naus' meaning 'ship'. Originally it was specifically about feeling sick on a boat.
Nausea started out as 'ship-sickness', which is why we still talk about 'motion sickness' on boats, cars, and planes. The same root 'naus' shows up in 'nautical', which is all about ships and sailing.
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