Definition of pentad in English:

pentad

noun

technical
  • A group or set of five.

    • ‘The classic pentad in thrombotic thrombocytopenic purpura includes fever, neurologic changes, renal failure, microangiopathic hemolytic anemia and thrombocytopenia.’

Origin

Mid 17th century: from Greek pentas, pentad-, from pente five.

Pronunciation:

pentad

/ˈpenˌtad/