Definition of gabbro
: a granular igneous rock composed essentially of calcic plagioclase, a ferromagnesian mineral, and accessory minerals
gabbroicplay \ga-ˈbrō-ik\ adjective
Recent Examples of gabbro from the Web
The rise itself is a large plateau about the size of California that contains 2,500,000 cubic kilometers of most basalt and gabbro (the stuff of oceanic crust).
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Britannica.com: Encyclopedia article about gabbro
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