Couplet
From Conservapedia
A couplet is two lines of poetic verse that present a single concept or idea. The lines usually rhyme and have the same poetic meter. A good example is the following conclusion to a sonnet by Edna St. Vincent Millay:
| “ | Whether or not we find what we are seeking is idle, biologically speaking. | ” |
A heroic couplet is a couplet with iambic pentameter.