Amphibrachic pentameter: A metrical line composed of five amphibrachic feet. An amphibrach is a three-syllable foot with the pattern unstressed-stressed-unstressed (x / x). Thus, this line would consist of fifteen syllables. Similar to the amphibrachic hexameter, there is no mention of its use in English poetry within the provided context. It exists as a theoretical possibility within metrical science, representing one of many potential, yet untried, rhythmic structures. The study of such rare or non-existent meters contributes to a comprehensive understanding of the full range of metrical options, but it also highlights the practical realities that limit a poet's choices. Factors like the natural rhythms of the English language, ease of pronunciation, and aesthetic preference mean that only a small fraction of theoretically possible meters become part of the standard poetic canon.

Five-foot amphibrachic line: fifteen syllables alternating unstressed-stressed-unstressed. Rare in English. Related to pentameter variations. Creates galloping or rocking rhythm. Study trisyllabic substitution in traditional meters.