Di″a‐base (?), n. [F. diabase, fr. Gr. � a crossing or passing over, fr. �; � + � to go; — so called by Brongniart, because it passes over to diorite.] (Min.) 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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.