diplococcus

/ˌdɪploʊˈkɑkəs/
noun
  1. A type of bacterium that occurs in pairs of round cells, often causing infections in humans.
    • Some forms of pneumonia are caused by a diplococcus bacterium.
    • The lab technician identified a diplococcus under the microscope.
    • The doctor explained that a diplococcus infection can be treated with antibiotics.