manganese

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic;
used in making steel;
occurs in many minerals
• Syn:
Mn, atomic number 25
• Hypernyms:
metallic element, metal
• Substance Holonyms:
hausmannite, manganite, psilomelane, pyrolusite, rhodochrosite