Asked in Plural Nouns
Plural Nouns

What is the plural of platypus?


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"Platypus" or "platypuses" are both accepted plural forms.

The plural of platypus is not platypi. It is unfortunate that some dictionaries include platypi as a plural. Listing "octopi" as the plural of octopus is also incorrect, for the same reason. Both words are from Greek, not Latin.

"Platypi" is a colloquialism, and incorrect both grammatically and etymologically. The term uses pseudo-Latin rules.