[ad-uh-man-teen, -tin, -tahyn]
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Origin of adamantine

1200–1250; Middle English < Latin adamantinus < Greek adamántinos. See adamant, -ine1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for adamantine

Historical Examples of adamantine

British Dictionary definitions for adamantine


  1. very hard; unbreakable or unyielding
  2. having the lustre of a diamond
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

Word Origin and History for adamantine

c.1200, from Latin adamantinus "hard as steel, inflexible," from Greek adamantinos, from adamas (see adamant (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper