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Noun calcedony has 1 sense
  1. chalcedony, calcedony - a milky or grayish translucent to transparent quartz
    --1 is a kind of quartz; transparent gem
    --1 has particulars:
     agate; bloodstone, heliotrope; carnelian, cornelian; chrysoprase; onyx; plasma; sard, sardine, sardius
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