Which suffix means run; running?

• A. ped/o
• B. immune/o
• C. -clast
• D. -drome

Answer: (D)

The suffix that conveys the idea of running comes from the Greek root for run, dromos. When -drome is added to a word part, it indicates a running, course, or manner of movement or action. That makes -drome the best fit for “run; running.”

To see why the others don’t fit: -clast means to break down or crumble, used in terms like osteoclast; ped/o refers to the foot; immune/o relates to the immune system. None of those convey running, so they don’t capture the intended meaning.