argillaceous

ar·gil·la·ceous

[ahr-juh-ley-shuhs]
adjective
1.
Geology, Petrology. of the nature of or resembling clay; clayey.
2.
containing a considerable amount of clayey matter.

Origin:
1725–35; < Latin argillāceus clayish. See argil, -aceous

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argillaceous (ˌɑːdʒɪˈleɪʃəs) [Click for IPA pronunciation guide]
 
adj
arenaceous Compare rudaceous (of sedimentary rocks and deposits) composed of very fine-grained material, such as clay, shale, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Argillaceous is always a great word to know.
So is lollapalooza. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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