奥陶纪

奧陶紀
Àotáo Jì
  1. (geology) the Ordovician period (part of the Paleozoic era, spanning from 485.4 to 443.4 million years ago)
  2. the Ordovician period (part of the Paleozoic era, spanning from 485.4 to 443.4 million years ago)

Wiktionary

Homographs

奥陶纪 Àotáojì Ordovician (geological period 495-440m years ago)

Entry Composition

1 奥陶 Àotáo the Ordovician
=2 纪 Jǐ
  1. surname Ji
  2. also pr. Jì
=2 纪 jì
  1. order
  2. discipline
  3. age
  4. era
  5. period
  6. to chronicle