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Of or relating to a mineral that can be cut or severed smoothly by a knife but cannot withstand pulverization.
sec·til′i·ty (-tĭl′ĭ-tē) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.