ammonoid

[am-uh-noid]

am·mo·noid

[am-uh-noid]
noun
any cephalopod mollusk of the extinct order Ammonoidea, from the Devonian to the Cretaceous periods, having a coiled, chambered shell.

Origin:
1880–85; < Neo-Latin Ammonoidea, equivalent to Ammon(ites) name of the order + -oidea -oidea; see ammonite2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ammonoid is always a great word to know.
So is lollapalooza. Does it mean:
a chattering or flighty, light-headed person.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
American Heritage
Science Dictionary
ammonoid   (ām'ə-noid')  Pronunciation Key 
Any of various extinct cephalopods of the subclass Ammonoidea living from the Devonian to the Cretaceous Periods. Ammonoids had a symmetrical, coiled, chambered shell with angular sutures between the chambers. They are closely related to the nautiloids, including the modern-day chambered nautilus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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