A person who specializes in or is devoted to experimentation; one who practices experimentalism as a philosophical or methodological approach.
From experiment + -ist (suffix creating nouns for practitioners or believers in something). The -ist suffix, from Greek, denotes a follower, believer, or specialist, similar to 'artist,' 'chemist,' 'pianist,' and 'feminist.'
An 'experimentist' is more than just someone who does experiments—it's someone who *believes* in experimentation as a fundamental way of understanding the world, making it as much a philosophy as a practice!
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