Structure
Couplet
From French couplet: pair. The heroic couplet (iambic pentameter AA) was the dominant English verse form from Dryden through Pope.
Definition
Two successive lines of poetry that rhyme and generally form a self-contained unit of meaning.
Example
Shakespeare's Sonnet 18 ends: 'So long as men can breathe, or eyes can see, / So long lives this, and this gives life to thee.'