Definition of sub-treasurer in US English:
sub-treasurer
noun
An assistant or deputy treasurer; an official having charge of a sub-treasury.
Origin
Late 16th century; earliest use found in Richard Hakluyt (?1552–1616), geographer. From sub- + treasurer. Compare post-classical Latin subthesaurarius.
Pronunciation
sub-treasurer
/ˌsʌbˈtrɛʒ(ə)rə/