This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A five-line stanza.

n. A five line poetic form which consists of 2, 4, 6, 8 then 2 syllables.

n. A five line poetic form which consists of 1 noun, 2 adjectives, 3 actions, 4 feeling words, then 1 noun that is the same as top noun

n. In old military evolutions, an order of battle governing the drawing up of five battalions so as to constitute three lines—that is, a van, main body, and reserve.

n. A stanza of five lines.

"She sometimes writes free verse, sometimes in rhyme, often in a demanding syllabic form called cinquain."

sestet    octave    quatrain    couplet    septet