Definition of "pentameter"

pentameter

/pɛnˈtæmɪtə(ɹ)/

noun
countable and uncountable, plural pentameters
1. (poetry, countable) A line in a poem having five metrical feet.
  Quotations
  The best verses, more especially pentameters, are written on the principle of attracting and fixing the attention to their close.
  1822, Robert Bland, Elements of Latin Hexameters and Pentameters, third edition, London: John Robinson, page vi
2. (poetry) Poetic metre in which each line has five feet.