from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Chiefly British A dark, fine-grained igneous rock; diabase.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A fine-grained basaltic rock
from the GNU version of the Collaborative International Dictionary of English
- n. A dark, crystalline, igneous rock, chiefly pyroxene with labradorite.
- n. Coarse-grained basalt.
- n. Diabase.
- n. Any dark, igneous rock composed chiefly of silicates of iron and magnesium with some feldspar.
from The Century Dictionary and Cyclopedia
- n. A name given by Haüy to a rock of the basalt family, called by some a basaltic greenstone, the deception implied in the name referring to the difficulty of distinguishing the rock from other varieties also designated as greenstone.
French dolérite, from Greek doleros, deceitful (from its easily being mistaken for diorite), from dolos, trick; see del-2 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)