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"Motion sickness" is a noun which is often translated as "el mareo", and "nausea" is a noun which is often translated as "la náusea". Learn more about the difference between "motion sickness" and "nausea" below.
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nausea()
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
1. (medicine)
b. las náuseas (F)
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
I only feel nausea in the morning, before breakfast.Solo tengo náuseas por las mañanas, antes de desayunar.