chalcedony

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a milky or greyish translucent to transparent quartz
• Syn:
calcedony
• Hypernyms:
quartz, transparent gem
• Hyponyms:
agate, bloodstone, heliotrope, carnelian, cornelian,
chrysoprase, onyx, plasma, sard, sardine, sardius