Advertisement

Definition of "gabbro" [gab•bro]

  • A usually coarse-grained igneous rock composed chiefly of calcic plagioclase and pyroxene. Also called norite. (noun)
  • A dark coarse-grained basic plutonic igneous rock consisting of plagioclase feldspar, pyroxene, and often olivine (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

www.Collinsdictionary.com (c) HarperCollins Publishers Ltd 2016

Use "gabbro" in a sentence
  • "As to the speed of cutting, in the experiment quoted a bit of rather friable "gabbro," measuring three-quarters of an inch on the face by five-eighths of an inch thick, was cut clean through in six minutes, or by 3000 turns of the wheel."
  • "To illustrate the operations, I will describe a specific case, viz. that of grinding the section of "gabbro"'above described, for microscopical purposes."
  • "Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt."
Words like "gabbro"