adj. Surfaced, tarred, covered in stone or crushed rock (usually tar-coated).
adj. Made of metal or having metal fittings or plating.
v. Simple past tense and past participle of metal.
Word Usage
"Though they are forever supplying definitions from the Oxford English Dictionary, neither appears to have looked up "metalled," both believing that a "metalled road" has something to do with metal (rather than broken stone)."