octopii

English

In imitation of Latin nominative plural forms of nouns ending in ius. Compare walrii and penii.

octopii

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

单词	octopii
释义	octopii English Etymology In imitation of Latin nominative plural forms of nouns ending in ius. Compare walrii and penii. Noun octopii (nonstandard, proscribed, rare) Misconstructed plural form of octopus. Usage notes The plural form octopii is doubly incorrect. Firstly, octopus* derives from Greek, not Latin; its etymologically-consistent plural form is octopodes. Secondly, even if octopus were a second-declension Latin noun, the plural form would be octopi; in the correct plurals radii* and gladii, with which octopii is analogous, the first ‘i’s are part of the words’ stems (radi-* and gladi-), and not their case endings — for octopii to be the plural, octopius would need to be the singular.
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