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In English grammar, a false singular occurs when a singular noun ending in a s or z sound is understood as a plural from which a new singular is constructed. The false singular is a form of back-formation.
Some false singulars become standard English. For example, pea was originally a false singular from pease pl. peasen. (The old word remains in the phrase pease porridge.)
The non-standard historical forms Chinee and Portuguee are also false singulars, from Chinese and Portuguese.