The definition of a quatrain is a group of four lines in a poem.
An example of a quatrain is a stanza in a poem.
a stanza or poem of four lines, often rhyming abab, abba, or abcb
Origin of quatrainFrench ; from quatre ; from Classical Latin quattuor, four
A stanza or poem of four lines.
Origin of quatrainFrench, from Old French, from quatre, four, from Latin quattuor; see kwetwer- in Indo-European roots.