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ammonoid

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.06 sec.
am·mo·noid  (m-noid)
n.
Variant of ammonite.
ammonoid  (m-noid)
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.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.ammonoidammonoid - one of the coiled chambered fossil shells of extinct mollusks
ammonite
fossil - the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil
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