GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Demonstrator (?; 277), 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 demonstration7.
   
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