Verse in iambic pentameter without rhyme scheme, often used in verse drama in the sixteenth century (Marlowe and Shakespeare) and later used for poetry (Milton, Wordsworth's The Prelude, Browning).
Editors. "Blank Verse". The Literary Encyclopedia. First published 01 November 2001
[http://www.litencyc.com/php/stopics.php?rec=true&UID=129, accessed 07 July 2015.]