Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of pretertiary is as below...

Pretertiary :: Pretertiary (a.) Earlier than Tertiary.

Diabase :: Diabase (n.) A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; -- often limited to rocks pretertiary in age. It includes part of what was early called greenstone..

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