conchoidal definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Mineralogy producing smooth convexities or concavities, like those of a clamshell, when fractured: said of a brittle substance
Origin: ; from Classical Greek konchoeidēs (see conchoid) plush -al
conchoidal definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Of, relating to, or being a surface characterized by smooth, shell-like convexities and concavities, as on fractured obsidian.
Origin: From Greek konkhoeidēs, mussellike : konkho-, concho- + -oeidēs, -oid.
- con·choiˈdal·ly adverb
conchoidal - Science Definition
Of or relating to a mineral or rock surface that is characterized by smooth, shell-like curves. Obsidian and quartz often have conchoidal fractures.