reduplicated plural
Definition - The grammatical form that results from the superfluous use of a second plural ending. For example, in the phrase two dogs the pluralizing s on dogs is superfluous because the two gives all the information that is necessary to indicate that this is a plural.

As opposed to a double plural, where an additional plural ending has been added to an already pluralized word because the first has lost its plural force. For example, the word kine was coined as a double plural of the Middle English kye, cows.

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