The Tetrameter reference article from the English Wikipedia on 24-Jul-2004
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Tetrameter

Helping orphans the way you would do it
In poetry, a tetrameter is a line of four metrical feet:

And the sheen of their spears was like stars on the sea (Anapaest tetrameter) (Byron, "The Destruction of Sennacherib")

"You who are bent and bald and blind" (Iambic tetrameter, except for the first foot which is a trochee) (Yeats, "The Wanderings of Oisin")

"Peter, Peter, pumpkin-eater" (trochaic tetrameter)