Definition of "kappa" []

• The tenth letter of the Greek alphabet. See Table at alphabet. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "It tells the story of Asuka, a humble fishery employee who falls in love with a mythical aquatic creature called a kappa—who is actually the reincarnation of a long-dead boyfriend."
• "They made bed coverings called kappa moe by sewing together several layers of kapa with large running stitches and decorating the top with traditional patterns made from natural dyes."
• "The genders differ when it comes to treatment, too, at least in the case of a class of painkillers called kappa opioids, which appear to be more effective in women than in men."