Foreign plurals in English

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Foreign Plural forms

These nouns have irregular plural forms. They often make their plurals according to the rules of the language they were taken from (e.g. Latin or Greek). Sometimes there is more than one plural form possible or these forms have different meanings. Always use a good dictionary when using foreign plurals. Here are some examples.

Singular Plural
analysis analyses
appendix appendixes/appendices
axis axes
basis bases
cactus cactuses/cacti
criterion criteria
datum data
diagnosis diagnoses
index indexes/indices
medium mediums/media
oasis oases
octopus octopuses/octopi
phenomenon phenomena
syllabus syllabuses/syllabi
thesis theses

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