n. [ L.: cf. F. démonstrateur. ] 1. One who demonstrates; specif.(a) one who proves anything with certainty, or establishes it by indubitable evidence. (b) one who shows how a certain device operates or a procedure is performed. [ 1913 Webster ]
2. (Anat.) A teacher of practical anatomy. [ 1913 Webster ]
3. a person who participates in a demonstration{ 7 }. [ PJC ]