ironclad
UK[ˈaɪənklæd]US[ˈaɪərnklæd]
adj
covered or protected with iron
adj
very strong and cannot be changed or argued against
Morpheme Breakdown
iron
clad
iron
clad
Etymology
the word 'ironclad' is a compound formed from two old english elements. 'iron' originates from proto-germanic 'īsarną', likely borrowed from a celtic source, referring to the metal. 'clad' derives from the old english verb 'clāthian', meaning to clothe, which is related to 'cloth'. the literal meaning, 'clothed in iron', was first used in the mid-19th century to describe warships armored with iron plates. this vivid physical imagery was then extended metaphorically to describe arguments, agreements, or guarantees that are as strong and unbreakable as iron armor.
Analysis
Structure: iron + clad
iron (old english, 'īren', a strong, hard magnetic metal); clad (old english, 'clāthod', past participle of 'clāthian', meaning to clothe or cover)
Examples
the two nations signed an ironclad treaty to ensure lasting peace.
his alibi was ironclad, leaving no room for doubt.
early ironclad ships revolutionized naval warfare.