Foci is the plural form of the singular noun focus.
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The word "focus" has a single plural form, which is "focuses."
Some examples of nouns ending in -us that have plural forms ending in -era include "cactus" (plural: cacti), "focus" (plural: foci), and "syllabus" (plural: syllabi).
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The plural form of "vest" is "vests."
The plural form of "syllabus" is "syllabi."