Used attributively, especially before another noun or in the colour term "battleship gray"
Definitions
Relating to or characteristic of a battleship or its qualities (strength, heavy armour, etc.). The new cruiser was fitted with battleship armour plates.
Of a dull, steely-gray colour reminiscent of naval warships. She painted the kitchen cabinets a subtle battleship gray.
Synonyms
heavily armed
gunmetal (as a color)