from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A dark-gray to black, fine-textured igneous rock composed mainly of feldspar and pyroxene and used for monuments and as crushed stone.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A fine-grained igneous rock composed mostly of pyroxene and feldspar
from the GNU version of the Collaborative International Dictionary of English
- 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.
from The Century Dictionary and Cyclopedia
- n. The name originally given by A. Brongniart to a rock which Haüy later designated as diorite, which name Brongniart himself adopted in preference to that of diabase.
French, partly from Greek diabasis, a crossing over (from diabainein, to pass through or over; see diabetes) and partly from diabase (dia-, two alteration of di-, from Greek di-; see di-1 + base, basis from Old French; see base1).(American Heritage® Dictionary of the English Language, Fourth Edition)