There are more mistakes than words here. To begin with, let's say that k 333;an is the transliteration of Japanese 20844; 26696; (kooan), a variant similar to greek philosophical aporia that is used in Zen Buddhism to be interpreted by the student. It is written the same in singular and plural, and the Castilianized version can be koan -since in Spanish we do not have the long /o/ - so if we needed to name more than one the correct construction for us would be 'koanes'. On the other hand, they are all abstract, the idea is not to interpret them literally, so with the adjective a pleonasm is created, which even if it were correct, is not locution and does not fit as a dictionary entry.
