poetry question

Factual Questions
1

i’m writing an explication, and i cannot think of the term that describes a broken line of iambic pentameter.

i.e. (frost at midnight, coleridge)

Echo or mirro seeking of itself,
And makes a toy of Thought.

                       But O! how oft,

How oft, at school, etc.

thanks

2

dammit that wasnt formatted correctly

Echo or mirro seeking of itself,
And makes a toy of Thought.

<SPACE>--------------------But O! how oft,
How oft, at school, etc.

3

I’m sorry. I don’t know the answer to your q. My guess would be an ellipsis, but I don’t know. However, I also want to pirate your OP to raise a q. of my own, which I’m sure you know the answer. What do you call it when you have an internal rhyme?