noun. One who makes experiments; one who practises experimentation.

noun. One who makes experiments, especially one who likes to experiment; an experimenter.

noun. One who relies primarily on experimentation and the evidence of one's own senses; an empiricist; -- contrasted with theoretician or dogmatist.

noun. One who performs experiments.

noun. A person who values the results of experiments over theory.

noun. A person who seeks or enjoys new experiences.

"The modern experimentalist is often more manager than physicist."

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experimenter