Definition of supercargoes:
(n) :
(historical) An officer on board a merchant ship who is in charge of the cargo and its sale; if there are two such officers, the senior one, the other being the subcargo.
(n) :
(figurative) Any overseer or superintendent; also, an agent or representative; or an intermediary; a go-between, a middleman.
(n) :
(obsolete) An agent or representative of a company in charge of its overseas business.
(n) :
(nautical) Synonym of supracargo