experimenter

noun

ex·​per·​i·​ment·​er

variants or experimentor

", 

(ˌ)⸗ˌ⸗⸗ˈmen‧ˌtȯ(ə)r, 

-ȯ(ə)

plural -s

: one that experiments or conducts an experiment

specifically : one that conducts an experiment in introspective psychology by arranging and determining the physical conditions of the observer's experience

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Kids Definition

experimenter

noun

ex·​per·​i·​ment·​er

ik-ˈsper-ə-ˌment-ər

: a person who experiments or conducts an experiment