'Quatrain' definitions:

Definition of 'quatrain'

From: WordNet
noun
A stanza of four lines

Definition of 'Quatrain'

From: GCIDE
  • Quatrain \Quat"rain\, n. [F., fr. quatre four, L. quattuor, quatuor. See Four.] (Pros.) A stanza of four lines rhyming alternately. --Dryden. [1913 Webster]