Dem″on‐stra′tor (?; 277), n. [L.: cf. F. démonstrateur.] 1. One who demonstrates; one who proves anything with certainty, or establishes it by indubitable evidence.
2. (Anat.) A teacher of practical anatomy.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.