Definitions

1. interjection

an expression of wonder, excitement, or surprise

“She let out an ‘ooh’ of amazement as the rollercoaster crested the top of the hill.”

2. exclamation

a sudden, usually emotional, expression of feeling

“Ooh, look at that beautiful sunset!”

3. noun

a small sound of surprise or pleasure

“She heard a faint ‘ooh’ from the crowd when the contestant won the prize.”