Mid 19th century; earliest use found in The Athenaeum. From classical Latin perturbāt-, past participial stem of perturbāreperturb + -ory. Compare post-classical Latin perturbatorius causing disturbance.
Definition of perturbatory in US English:
perturbatory
adjective
Perturbative.
Origin
Mid 19th century; earliest use found in The Athenaeum. From classical Latin perturbāt-, past participial stem of perturbāre perturb + -ory. Compare post-classical Latin perturbatorius causing disturbance.