Foreign plurals in English

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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