cambrian period
cambrian period

noun
from 544 million to about 500 million years ago; marine invertebrates [syn: Cambrian] 
WordNet® 3.0, © 2006 by Princeton University.
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Cambrian period is always a great word to know.
So is doohickey. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a gadget; dingus; thingumbob.
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