blank verse
Rhymeless verse in continu- ous decasyllabics with iambic or trochaic rhythm, first used in English by the Earl of Surrey in his version of the &neid> about 1540. There is other unrhymed verse, but it is not usual to extend to such poems as Collms's Ode to Evening, Whitman's Leaves of Grass, or the vers libre of to-day, the name blank verse.