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).
Citation:
Editors. "Blank Verse".
The Literary Encyclopedia. First published 01 November 2001
[http://www.litencyc.com/php/stopics.php?rec=true&UID=129, accessed 25 May 2013.]