nausea and dizziness, sometimes accompanied by vomiting, resulting from the rocking or swaying motion of a vessel in which one is traveling at sea.
Compare motion sickness.

1615–25; sea + sickness Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
seasick (ˈsiːˌsɪk)
suffering from nausea and dizziness caused by the motion of a ship at sea

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

seasickness sea·sick·ness (sē'sĭk'nĭs)
Motion sickness resulting from the pitching and rolling of a ship or boat in water, especially at sea. Also called mal de mer.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
In terms of ethics, it's not all that different from a diver who takes a
  seasickness pill on the day of an important dive.
The crew also sells seasickness tablets for the ride from shore, which can be
Keep in mind that using binoculars on a boat for an extended period of time
  could increase chances of seasickness.
Lost research opportunities, broken gear and seasickness are still a part of
  modern day research cruises.
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