Poetic form

Terza rima

A chain of interlocking three-line stanzas rhymed ABA BCB CDC… The form Dante used for the Divine Comedy; sustains long narrative without losing momentum.

Three-line stanzas (tercets) rhymed ABA, BCB, CDC, DED… The middle rhyme of each tercet seeds the outer rhymes of the next, creating an unbroken chain. A closing tercet or couplet seals the rhyme.

Terza rima was invented by Dante for the Divine Comedy (begun c. 1308). The form's name — "third rhyme" — describes its interlocking chain: each tercet's middle line rhymes with the outer lines of the next tercet, so the rhyme scheme is ABA BCB CDC DED EFE… extending indefinitely. The chain propels the verse forward: each tercet introduces a new rhyme sound while completing the rhyme set up two tercets earlier. Dante used the form across all three canticles (Inferno, Purgatorio, Paradiso) for a total of 14,233 lines — one of the longest sustained achievements in any poetic form.

The form is harder in English than in Italian. Italian is a rhyme-rich language; almost any word has many candidate rhymes. English is rhyme-poor, especially at the level of feminine rhymes (rhymes on two-syllable endings). Sustained terza rima in English requires either great patience with available rhymes or a willingness to use slant rhyme freely. Most English-language terza rima works at length only when the poet relaxes the rhyme constraint.

Despite the difficulty, English poets have used the form productively. Shelley's "Ode to the West Wind" (1819) is the form's most-celebrated English example — five 14-line sections each in terza rima, with a closing couplet sealing each section. Robert Frost's "Acquainted with the Night" (1928) is a 14-line terza-rima sonnet hybrid. Contemporary poets use the form for both narrative and lyric, usually with slant rhyme.

The form's strength is forward motion. Where the sonnet folds back on itself with its volta, terza rima never folds — it propels through each tercet into the next, completing rhymes as it goes. For sustained narrative, the form is well-suited; Dante used it for the largest narrative arc in European literature.

Structure

Tercet and meter

Three-line stanzas. Italian terza rima uses endecasillabi (eleven-syllable lines); English terza rima conventionally uses iambic pentameter, though Shelley uses ten-syllable lines with substantial substitution, and contemporary poets sometimes work in tetrameter or hexameter.

The chain

The interlocking rhyme scheme:

Tercet 1: A / B / A
Tercet 2: B / C / B
Tercet 3: C / D / C
Tercet 4: D / E / D
(continuing indefinitely)

The middle line of each tercet rhymes with the outer lines of the next. Each new tercet introduces a new rhyme sound (in the middle) while completing the rhyme set up two tercets earlier. The chain never breaks.

Closing

The chain cannot end on its own. Conventional closings:

A final tercet rhymed XYX where Y is a new sound — leaving a single line unresolved (rare).
A closing couplet rhymed XX after a tercet ABA → the couplet seals the rhyme.
A closing tercet rhymed AAA — folding the chain back on itself.

Dante uses the closing-couplet pattern at the end of each canto; Shelley uses a closing couplet at the end of each 14-line section of "Ode to the West Wind".

Forward momentum

The form's defining quality. Where rhyme-stanza forms like quatrains close each unit, terza rima opens each unit into the next. The reader's ear is always anticipating the next rhyme's closing. For sustained narrative — Dante chose it for the Comedy precisely for this — the form is unparalleled.

Common pitfalls (not rules)

Strict rhyme in English without slant alternatives. The form is rhyme-rich in Italian and rhyme-poor in English; insisting on strict rhyme through long stretches often forces diction into corners.
Closing the chain without a closing pattern. The form needs an explicit closing tercet or couplet; trailing off mid-chain reads as unfinished.
Lyric stasis. The form is built for forward motion; using it for inward meditation without narrative arc tends to fight its design.
Tetrameter or shorter without rhythmic compensation. The form's grandeur comes partly from the long line; shorter lines work but require attention to keep the chain audible.

Lines from the tradition

Midway in our life's journey, I went astray from the straight road and woke to find myself alone in a dark wood. How shall I say what wood that was! I never saw so drear, so rank, so arduous a wilderness! Its very memory gives a shape to fear.

Sample Poet

The opening of the *Inferno*. Ciardi's English translation preserves Dante's terza rima with slant rhyme where strict rhyme would strain. The forward momentum of the chain — *astray / say / drear / wilderness / fear* — carries the reader into the wood without resting.

O wild West Wind, thou breath of Autumn's being, Thou, from whose unseen presence the leaves dead Are driven, like ghosts from an enchanter fleeing, Yellow, and black, and pale, and hectic red, Pestilence-stricken multitudes: O thou, Who chariotest to their dark wintry bed.

Sample Poet

The opening of Shelley's ode — terza rima in iambic pentameter, with each 14-line section closing in a couplet. The chain (*being / dead / fleeing / red / thou / bed*) propels the syntax across stanzaic breaks in a single long sentence.

Try this

Write a 16-line terza-rima passage (five tercets plus a closing couplet, AB BCB CDC DED EFE FF) describing a place you have moved through — a road, a corridor, a path. Use slant rhyme where strict rhyme strains the diction; let the chain push the description forward.

Five tercets + closing couplet, ABA BCB CDC DED EFE FF.
Slant rhyme welcome; strict rhyme not required.
The closing couplet must seal the chain — not trail off mid-stanza.

Share your poem

Structure

Tercet and meter

The chain

Closing

Forward momentum

Common pitfalls (not rules)

Lines from the tradition

Try this

Further reading