Definition of -o in English:

-o

Syllabification: -o

suffix

Forming chiefly informal or slang variants or derivatives such as righto, wino.

Origin

perhaps from oh1, reinforced by abbreviated forms such as hippo, photo.

Definition of -o in:

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Word of the day humoresque
Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music