spinel

Từ điển Oxford Learners Wordfinder Dictionary

noun

a hard glassy mineral consisting of an oxide of magnesium and aluminum;
occurs in various colors that are used as gemstones
• Hypernyms:
mineral
• Hyponyms:
spinel ruby, ruby spinel, Ceylonite, pleonaste
• Substance Meronyms:
magnesium, Mg, atomic number 12