IronsidesPronunciation: /ˈʌɪənsʌɪdz/Definition of Ironsides a nickname for Oliver Cromwell. [as plural noun] (in the English Civil War) Cromwell’s cavalry troopers, so called by their Royalist opponents in allusion to their hardiness in battle. Ironsides in other Oxford dictionaries Definition of Ironsides in the US English dictionary
