1. the tenth letter of the Greek alphabet (Κ, κ)
2. a water spirit in Japanese folklore, typically depicted as a humanoid creature with a bowl-shaped head
Usage: Japanese mythology

Examples

• The Greek letter kappa is used in mathematics to represent various constants.
• In physics, kappa often denotes the dielectric constant.
• The fraternity’s name included the letter kappa.
• According to legend, the kappa would challenge travelers to sumo wrestling matches.
• The kappa is said to live in rivers and ponds throughout Japan.
• Children were warned not to swim alone because of stories about the kappa.