argillite

[ahr-juh-lahyt]

ar·gil·lite

[ahr-juh-lahyt]
noun
any compact sedimentary rock composed mainly of clay materials; clay stone.

Origin:
1785–95; < Latin argill(a) argil + -ite1

ar·gil·lit·ic [ahr-juh-lit-ik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Argillite is always a great word to know.
So is zedonk. Does it mean:
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.
the offspring of a zebra and a donkey.
Collins
World English Dictionary
argillite (ˈɑːdʒɪˌlaɪt)
 
n
any argillaceous rock, esp a hardened mudstone
 
[C18: from Latin argilla clay (from Greek argillos) + -ite1]
 
argillitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
argillite   (är'jə-līt')  Pronunciation Key 
A highly compacted sedimentary or slightly metamorphic rock consisting primarily of particles of clay or silt. Argillite differs from mudstone in that it does not have the same fine laminations, and from shale and slate in that it is not fissile.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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