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English definition of “Cambrian”

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Cambrian

adjective uk   /ˈkæm.bri.ən/ specialized us  
from or referring to the period of time between about 543 and 490 million years ago, in which many different types of invertebrates (= animals with no back bone) first appeared: the Cambrian period Cambrian rocks
the Cambrian
noun [S] uk   us  
the Cambrian period
(Definition of Cambrian from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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