Diabase
Pronunciation : Di"a*base
Part of Speech : n.
Etymology : [F. diabase, fr. Gr. (Min.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913