octopii

Etymology
In imitation of Latin nominative plural forms of nouns ending in -ius, such as >. Compare and.

Usage notes

 * The plural form is doubly incorrect. Firstly,  derives from Greek, not Latin; its etymologically-consistent plural form is . Secondly, even if  were a second-declension Latin noun, the plural form would be ; in the correct plurals  and, with which  is analogous, the first ‘i’s are part of the words’ stems ( and ), and not their case endings — for  to be the plural,  would need to be the singular.