O·khotsk (?-k?tsk?, ?-KHôtsk?), Sea of An arm of the northwest Pacific Ocean west of the Kamchatka Peninsula and Kuril Islands. It is connected with the Sea of Japan by narrow straits.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.