Entry 3 senses Webster, 1913

Demonstrator

/dĕm'-ən-strātˌ-ẽr/ · Dem·on·stra·tor · IPA /ˈdɛmənstɹeɪtə(ɹ)/

01 n. One who demonstrates;

1.
One who demonstrates;
2.
A teacher of practical anatomy.(Anat.)
3.
a person who participates in a demonstration{7}.