Poetry and Rhymes

What literary term can be defined as the basic unit of a line of poetry?

More Questions from Poetry and Rhymes
In 'On top of Spaghetti', what causes the loss of the meatball?
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Who had only 4 out of 900 poems published while alive?
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In the rhyme "Sing a Song of Sixpence", what did the blackbird do to the maid?
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In the kids' song "Hush Little Baby", what will Mama buy if the mockingbird won't sing?
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Where was Little Jack Horner sitting when he pulled out a plum?
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In "She Sells Seashells" where were the seashells sold?
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In "The Little Mermaid", what part of her body does the title character sacrifice for humanity?
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Mary of the nursery rhyme "Mary, Mary Quite Contrary" grows what?
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