Help Wordnik hunt for a million missing words by backing our Kickstarter!


from The Century Dictionary and Cyclopedia

  • n. In petrography, a fine-grained to aphanitic rock composed of orthoclase and lime-soda feldspars in about equal portions and subordinate amounts of ferromagnesian constituents. It is intermediate in composition between trachyte and andesite: similar to andesite-trachyte, trachydolerite, etc.


Sorry, no etymologies found.


Sorry, no example sentences found.


Log in or sign up to get involved in the conversation. It's quick and easy.