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Từ điển WordNet v3.1 - WordNet Dictionary

noun

a heavy ductile magnetic metallic element;
is silver-white in pure form but readily rusts;
used in construction and tools and armament;
plays a role in the transport of oxygen by the blood
• Syn:
iron, atomic number 26
• Hypernyms:
metallic element, metal
• Hyponyms:
alpha iron, beta iron, gamma iron, delta iron, ingot iron,
cast iron, wrought iron, galvanized iron, pig iron, scrap iron, structural iron
• Substance Holonyms:
steel, iron ore