A line or verse of poetry that contains seven metrical feet (basic unit of rhythm of verse): "A heptameter consists of fourteen or twenty-one syllables."

"In English poetry, a meter is the systematic arrangement of accented and unaccented syllables in regular, repeated patterns and any line with a metrical scheme can be divided into units called feet; including the following lines of poetry:

• monometer (one foot)
• dimeter (two feet)
• trimeter (three feet)
• tetrameter (four feet)
• pentameter (five feet)
• hexameter (six feet)
• heptameter (seven feet)
• octameter (eight feet)