I thought it was Zauri, for 2 and Zaurii if it was more than 2. I stoped my considerations there even though I wasn't sure. I was afraid I'd eventually have to use xkill to close my mind if i had to keep adding an i for each increase.
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If we consider it as a 4th declension Latin noun rather than 2nd, we can have it the same as the singular - or, if you use the American Classical pronunciation and orthography I learned in high school, put a macron over the second syllable to form the plural.
singular
Nominative - zaurus
Genitive- zaurus
Dative - zaurui, zauru
Accusative - zaurum
Ablative - zauru
Locative zauri
Vocative zaurus
plural Plural
Nominative - zaurus
Genitive - zauruum
Dative - zauribus, (zaurubus)
Accusative - zaurus
Ablative - zauribus, (zaurubus)
Locative - zauribus, (zaurubus)
Vocative - zaurus
... at least <b>manus</b> works that way, and it means "hand".
-- the Classical geek