ad·a·man·tine

[ad-uh-man-teen, -tin, -tahyn]
adjective
1.
utterly unyielding or firm in attitude or opinion.
2.
too hard to cut, break, or pierce.
3.
like a diamond in luster.

Origin:
1200–1250; Middle English < Latin adamantinus < Greek adamántinos. See adamant, -ine1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To adamantine
Collins
World English Dictionary
adamantine (ˌædəˈmæntaɪn) [Click for IPA pronunciation guide]
 
adj
1.  very hard; unbreakable or unyielding
2.  having the lustre of a diamond

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Adamantine is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Etymonline
Word Origin & History

adamantine
late 14c., from L. adamantinus, from Gk. adamantinos, from adamas (see adamant).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
Most diamonds are transparent and with a strong adamantine luster.
Diamond is the hardest of all naturally occurring substances, is transparent if
  pure, and has an adamantine luster.
Light was provided by adamantine candles and/or coal or lard oil lamps.
The unambiguous factuality of a single achievement is adamantine.
Related Words
Copyright © 2013 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature
FAVORITES
RECENT