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conchoidal

[kong-koid-l]
adjective Mineralogy.
  1. noting a shell-like fracture form produced on certain minerals by a blow.
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Origin of conchoidal

First recorded in 1660–70; conchoid + -al1
Related formscon·choi·dal·ly, adverbsub·con·choi·dal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for conchoidal

Historical Examples of conchoidal


British Dictionary definitions for conchoidal

conchoidal

adjective
  1. (of the fracture of minerals and rocks) having smooth shell-shaped convex and concave surfaces
  2. (of minerals and rocks, such as flint) having such a fracture
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Derived Formsconchoidally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

conchoidal in Science

conchoidal

[kŏng-koidl]
  1. Of or relating to a mineral or rock surface that is characterized by smooth, shell-like curves. Obsidian and quartz often have conchoidal fractures.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.