Pei‐ras″tic (pī̍‐răs″tĭk), a. [Gr. πειραστικόσ, fr. πειρα̑ν to try, fr. πει̑ρα a trial.] Fitted for trial or test; experimental; tentative; treating of attempts.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.