Meaning of あのー in Japanese

Definition of あのー

あのう(anou) · あの(ano) · あのー(anoo)

あのー、先生せんせい？黒板こくばんに書いてあるの、指数関数しすうかんすうじゃなくて三角関数さんかくかんすうですけど・・・。

Er, Sir? What's written on the blackboard isn't an exponential function but a trigonometric one ...

I think we're out of your size.

Hi. I feel kind of sick.