Late 17th century; earliest use found in Knightly Chetwood (bap. 1650, d. 1720), dean of Gloucester. From supplement + -or. Compare post-classical Latin supplementor.
Definition of supplementor in US English:
supplementor
nounˈsʌplɪmɛntə
= supplementer.
Origin
Late 17th century; earliest use found in Knightly Chetwood (bap. 1650, d. 1720), dean of Gloucester. From supplement + -or. Compare post-classical Latin supplementor.