mëoi noun "cat", a somewhat strange word by the standards of Tolkien's later Quenya (there are no other instances of final -oi in the singular). Some would read *mëo, if the word is to be used in LotR-style Quenya. Vardo Mëoita "Prince of Cats"; mëoita here seems to be a kind of adjective rather than a genitive (LT2:348). Tolkiens later, less problematic word yaulë may be preferred by writers (PE16:132)
yaulë noun "cat" (PE16:132). Compare mëoi.