Definify.com
Webster 1913 Edition
Diabase
Di′a-base
,Noun.
[F.
diabase
, fr. Gr. [GREEK] a crossing or passing over, fr. [GREEK]; [GREEK] + [GREEK] 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
. Webster 1828 Edition
Diabase
DIABASE
,Noun.