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pentameter (s), pentameters (pl) (nouns)
1. A line of poetry with five strong beats or a line of verse consisting of five units of rhythm; such as, five pairs of stressed and unstressed syllables.
2. English verse composed in iambic pentameter.

The third line of Thomas Nashe's "Spring" is in pentameter: "Cold doth / not sting, / the pret / ty birds / do sing."

Spring

SPRING, the sweet Spring, is the year's pleasant king;
Then blooms each thing, then maids dance in a ring,
Cold doth not sting, the pretty birds do sing-
Cuckoo, jug-jug, pu-we, to-witta-woo!

The palm and may make country houses gay,
Lambs frisk and play, the shepherds pipe all day,
And we hear aye birds tune this merry lay-
Cuckoo, jug-jug, pu-we, to-witta-woo!

The fields breathe sweet, the daisies kiss our feet,
Young lovers meet, old wives a-sunning sit,
In every street these tunes our ears do greet-
Cuckoo, jug-jug, pu-we, to-witta-woo!
Spring, the sweet Spring!

—Thomas Nashe (1567–1601)

Iambic pentameter, in which each foot contains an unaccented syllable and an accented syllable, is the most common English poetic meter.

When a good actor recites lines from one of Shakespeare's plays, the audience is not constantly aware that he is speaking poetry written in iambic pentameter.