Word: koan
Part of speech: Noun
Syllables: ko
an
Definition: A riddle with no solution, used to provoke reflection on the inadequacy of logical reasoning, and to lead to enlightenment.
Morphemes:
Affix: koan
Language: en
PoS: Noun
Meaning: A riddle with no solution, used to provoke reflection on the inadequacy of logical reasoning, and to lead to enlightenment.
Etymology Compounds: Affix: 公案
Language: ja
Decoded: Gong An 
Meaning: kōan