noun
mechanist
A person who adheres to mechanism, the philosophical doctrine that natural phenomena can be explained by mechanical laws.
彼は機械論者として、生命現象も物理法則で説明できると主張した。
As a mechanist, he argued that even life phenomena can be explained by physical laws.
機械論 is the doctrine of mechanism, while 機械論者 refers to a person who advocates or adheres to that doctrine.
Compound of 機械 (machine, mechanism), 論 (theory, argument), and 者 (person). The term is a direct translation of the Western philosophical concept of mechanism.