The Collaborative International Dictionary
Prisage \Pris"age\ (?; 48), n. [OF. prisage a praising, valuing, taxing; cf. LL. prisagium prisage; or from F. prise a taking, capture, prize. See Prize.] (O. Eng. Law)
A right belonging to the crown of England, of taking two tuns of wine from every ship importing twenty tuns or more, -- one before and one behind the mast. By charter of Edward I. butlerage was substituted for this.
--Blackstone.The share of merchandise taken as lawful prize at sea which belongs to the king or admiral.
Wiktionary
n. 1 (context legal UK obsolete English) A right belonging to the crown of England, of taking two tuns of wine from every ship importing twenty tuns or more: one before and one behind the mast. 2 (context obsolete English) The share of merchandise taken as lawful prize at sea which belongs to the king or admiral.