hard lead

Từ điển Oxford Learners Wordfinder Dictionary

noun

1. a lead alloy that contains about 5% antimony
• Syn:
antimonial lead
• Hypernyms:
lead, Pb, atomic number 82
• Hyponyms:
grid metal
2. unrefined lead that is hard because of the impurities it contains
• Hypernyms:
lead, Pb, atomic number 82