Chi
WordNet
noun
(1) The 22nd letter of the Greek alphabet
(2) The circulating life energy that in Chinese philosophy is thought to be inherent in all things; in traditional Chinese medicine the balance of negative and positive forms in the body is believed to be essential for good health
WiktionaryText
Letter
chi
- The twenty-second letter of the Classical and Modern Greek alphabets, and the twenty-third letter of Old and Ancient alphabets.