monometer
a rare form of verse in which each line consists of a single metrical unit (a foot or dipody). The best-known example of an entire poem in monometer is Robert Herrick's "Upon His Departure Hence": Thus I Passe by,And die:As One,Unknown,And gon:I'm made A shade, And laid I'th grave,There haveMy Cave.Where tell I dwell, Farewell.
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