Early 19th century; earliest use found in The Examiner. From remonstrate or its etymon post-classical Latin remonstrat-, past participial stem of remonstrare + -ory; compare -atory.
Definition of remonstratory in US English:
remonstratory
adjectiverɪˈmɒnstrət(ə)ri
rare
Remonstrative.
Origin
Early 19th century; earliest use found in The Examiner. From remonstrate or its etymon post-classical Latin remonstrat-, past participial stem of remonstrare + -ory; compare -atory.