Definition of -oon in English:

-oon

suffix

Forming nouns, originally from French words having the final stressed syllable -on: balloon buffoon

Origin

representing French -on, from Latin -onis, sometimes via Italian -one.

Definition of -oon in:

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Word of the day vituperate
Pronunciation: vɪˈtjuːpəreɪt
verb
blame or insult (someone) in strong language...