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ammonoid

 - 4 dictionary results

am⋅mo⋅noid

  [am-uh-noid]
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–noun
any cephalopod mollusk of the extinct order Ammonoidea, from the Devonian to the Cretaceous periods, having a coiled, chambered shell.
Origin:
1880–85; < NL Ammonoidea, equiv. to Ammon(ites) name of the order + -oidea -oidea; see ammonite 2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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am·mo·nite   (ām'ə-nīt')   
n.  The coiled, flat, chambered fossil shell of an extinct cephalopod mollusk that was abundant in the Cretaceous Period.

[New Latin Ammōnītēs, from Latin (cornū) Ammōnis, (horn) of Amen, ammonite, genitive of Ammōn, Amen, from Greek.]
am'mo·nit'ic (-nĭt'ĭk) adj.
am·mo·noid   (ām'ə-noid')   
n.  Variant of ammonite.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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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