The cambrian
-
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 meaning & definition 1 of The cambrian.
-
the Cambrian period (= the period between about 543 and 490 million years ago) :
The cambrian meaning & definition 2 of The cambrian.
