dĕcŭma, ae, f., v. decimus.
DE´CUMA a town of Hispania Baetica, near the river Baetis, and apparently on its left bank, near its...
Dictionary of Greek and Roman Geography
decuma or decima ae, f decimus; sc. pars, a tenth part, tithe, land-tax : hordei: Sardiniae binae ...
An Elementary Latin Dictionary