/uy"euhrn suyd'/ , n.
1. a strong person with great power of endurance or resistance.
2. ( cap. ) an epithet or nickname of Edmund II of England.
3. ( cap. ) Usually, Ironsides .
a. ( used with a sing. v. ) a nickname of Oliver Cromwell.
b. the soldiers serving under Cromwell.
4. ironsides , ( usually used with a sing. v. )
a. an ironclad.
b. Eastern U.S. scup.
[ 1250-1300; ME; see IRON, SIDE 1 ]