What is a verse or line consisting of four measures, that is, in iambic, trochaic, and anapestic verse, of eight feet; in other kinds of verse, of four feet called?

tetrameter — A verse or line consisting of four measures, that is, in iambic, trochaic, and anapestic verse, of eight feet; in other kinds of verse, of four feet. (Webster's 1913.)

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