“ The noun octopus is often made plural in English as octopi, originally from the mistaken belief that all Latin nouns ending in -us take -i to form their plural. However, this is only correct for Latin masculine nouns of the second declension. For Latin fourth-declension nouns, such as manus, the singular and plural forms both end in -us. For third declension nouns such as octopus, the plural is less regular. The noun octopus in Latin is a third-declension noun borrowed from the Greek. Although octopuses is generally considered correct in modern English, its plural in Latin is actually octopodes.
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