ackey
noun
ack·ey ˈa-kē 
plural ackeys
1
: a silver coin struck in England in 1796 and 1818 for use on the Gold Coast in western Africa
2
: a unit of value equivalent to one ackey
¹/₂-ackey and ¹/₄-ackey coins were struck
Word History
Etymology
alteration of ackee, the seeds of which were used as weights roughly equivalent to 20 grains of gold dust