What is the meaning of runner bean?

noun

• Tropical American bean with red flowers and mottled black beans similar to Phaseolus vulgaris but perennial; a preferred food bean in Great Britain.
  • synonyms: scarlet runner, scarlet runner bean, Dutch case-knife bean, Phaseolus coccineus, Phaseolus multiflorus
• Long bean pods usually sliced into half-inch lengths; a favorite in Britain.
  • synonyms: scarlet runner, scarlet runner bean, English runner bean