- a dark, fine-grained, usually extrusive igneous rock that is more basic than andesite, consisting chiefly of plagioclase feldspars and pyroxene: often found in vast sheets, it is the most common extrusive igneous rock
- a kind of unglazed, black pottery designed by Josiah Wedgwoodalso ba·salt′ware·
Origin of basaltearlier basaltes ; from L, a dark Ethiopian marble: term used by Pliny for basanites ; from Classical Greek basanit?s, species of slate used to test gold ; from basanos, touchstone, test (ult. ; from Egyptian b?nw) + -it?s, -ite
- A hard, dense, dark igneous rock composed chiefly of plagioclase feldspar, pyroxene, and olivine, and often having a glassy appearance.
- A kind of hard unglazed pottery.
Origin of basaltLatin basaltēs, alteration of basanītēs, touchstone, from Greek basanītēs (lithos), from basanos, Egyptian b&hlowbrev;n, graywacke.
columnar basalt at Sheepeater Cliff, Yellowstone National Park, Wyoming