From The Collaborative International Dictionary of English v.0.48:
Nausea \Nau"se*a\ (? or ?), n. [L., fr. Gr. ?, fr. nay^s ship.
See Nave of a church, and cf. Noise.]
Seasickness; hence, any similar sickness of the stomach
accompanied with a propensity to vomit; qualm; squeamishness
of the stomach; loathing.