Cho O·yu (ch?? ?-yo?o?) A peak, 8,188 m (26,864 ft) high, of the central Himalaya Mountains on the Nepal-China border.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.