jo·han·nes noun alsojo·an·nes\jōˈ(h)anə̇s\ (pluraljohannesalsojoannes) Etymology: after Johannes or Joannes John (or João) V died 1750 king of Portugal who first issued such coins and whose name appeared on them : an old Portuguese gold coin first issued in the 18th century and equivalent to 6400 reis — called also half joe; compare dobra