rails

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll
• Syn:
track, rail, runway
• Derivationally related forms:
rail (for: rail)
• Hypernyms:
bar
• Hyponyms:
third rail
• Part Holonyms:
railroad track, railroad, railway, tramline, tramway, streetcar track