Pronunciation: [mˈɛtə͡ld] (IPA) 
The word "metalled" is often spelled with two L's, despite its pronunciation ending in a single "L" sound. This is due to its origin in the British English practice of adding an extra "L" when forming the past tense of verbs ending in "L". In IPA phonetic transcription, the pronunciation of "metalled" would be /ˈmɛ.təld/ with the stress on the first syllable and a short "e" sound in the second syllable.
Metalled is an adjective derived from the verb "metal," which means to cover or surface a road, path, or other ground surface with a layer of small stones or roadstone, typically mixed with tar or bitumen. When a road or path is metalled, it undergoes the process of metalling, which involves laying a foundation and then mixing crushed stone or similar aggregate with a binding material like tar to create a hard, durable surface.
Typically, metalled roads offer better transportation conditions and increased durability compared to unmetalled roads or dirt tracks. The layer of stones bound together by tar or bitumen provides a stable, weather-resistant surface that reduces soil erosion, prevents the formation of mud or dust, and enhances traction for vehicles and pedestrians.
Metalled roads are commonly found in urban areas, towns, and highways, where there is a need for smoother, more reliable transportation. They facilitate efficient movement of vehicles, minimize maintenance requirements, and improve travel times and safety for road users.
The term "metalled" can also be used metaphorically to describe something that has been fortified, strengthened, or made more resilient. In this sense, it implies the addition of a protective layer or covering to enhance the durability or resilience of an object, structure, or concept.
Covered or laid over with broken stones, as a public road.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "metalled" is derived from the noun "metal", which refers to a hard, shiny material typically made from elements such as iron, copper, or gold. The suffix "-ed" is added to "metal" to form the past participle form of the verb, creating the adjective "metalled". This term is often used in reference to roads that have been covered with a layer of hard, compacted materials such as concrete or asphalt, which are commonly mixed with crushed stone and other aggregates. In this context, the word "metalled" describes the makeup of the road surface, indicating that it has been covered or improved with materials containing metal.
