World English Dictionary
Ediacaran (ˌiːdiːˈækərən)
1.  of, denoting, or formed in the last 50 million years of the Neoproterozoic era, during which a new texturally and chemically distinctive carbonate layer appeared, indicating climatic change
2.  the the Ediacaran period or rock system
[C20: named after the Ediacara Hills in the Flinders mountain range in South Australia]

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American Heritage
Science Dictionary
Ediacaran   (ē'dē-ä'kə-rən)  Pronunciation Key 
Relating to a group of fossilized organisms that are the earliest known remains of multicellular life. They are soft-bodied marine life forms that date from between 560 and 545 million years ago, during the late Precambrian Eon.
The American Heritage® Science Dictionary
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