Lewis & Short

Carchēdŏnĭus, a, um, adj., = Καρχηδόνιος, Carchedonian, i. e. Carthaginian (since Καρχηδών = Carthago): carbunculus, a brilliant precious stone frequently found in the country of the Carthaginians, Plin. 37, 7, 25, § 92 sq.
Hence, subst.: Car-chēdŏnĭus, ii, m., a Carthaginian, Plaut. Poen. prol. 53.