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demonstrator

/ˈdɛmənstɹeɪtə(ɹ)/ noun

In Latin: reclāmitātor Wiktionary

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about demonstrator at Wordnik → Where our words come from →

  1. One who demonstrates anything, or proves beyond doubt.
  2. The forefinger.
  3. One who takes part in a demonstration; a protester.