in French, singular 'un adieu', plural 'les adieux'
The foreign plural form of symposium is symposia, while the English plural form is symposiums.
Forum---Plural Form Forums,Foreign Plural Form Forumina
The plural of syllabus is syllabi.
the word emphasis is already singular because when in foreign plural it is emphases
Genii. However, it is often confused with the being that came out of Aladdin's lamp so people often say 'geniuses' to avoid confusion! This is according to my grandad, who is a genius!
The foreign plural form of symposium is symposia, while the English plural form is symposiums.
The plural form of addendum is addenda
Forum---Plural Form Forums,Foreign Plural Form Forumina
The plural form of apparatus is apparatuses. It has no foreign plural.
data IS the plural form of datum.
The singular form is bacterium; the plural form is bacteria.
The plural of syllabus is syllabi.
the word emphasis is already singular because when in foreign plural it is emphases
There are several possible plural forms of the English word cherub, which is a word of Hebrew origin. The one I think you are referring to is cherubim, which is derived directly from the Hebrew plural. Cherubs and cherubims also occur in English.
Ova is the plural form. The singular form is ovum.
Librettos
octopi