Definition of Old Ironsides in English:

Old Ironsides

Syllabification: Old I·ron·sides

Entry from US English dictionary

Nickname for the frigate Constitution, the oldest commissioned vessel in the US Navy. Launched in 1797, it defeated four British frigates in the War of 1812 and is permanently berthed at the Boston Navy Yard.

Origin

early 19th century: conferred by her crew when, during her first battle with the British vessel Guerrière, the cannon balls glanced off her thick oak hull.

Definition of Old Ironsides in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal