第三纪

dì sān jì

คำจำกัดความ

1. third period
2. tertiary (geological era since the extinction of the dinosaurs at the Cretaceous-Tertiary boundary 65 million years ago)

คำย่อยของ 第三纪

• 三 sān: three
• 第 dì: (prefix indicating ordinal number, as in 第六[dì liù] \sixth\)
• 纪 jì: order