Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An extinct cephalopod mollusk of the subclass Ammonoidea of the Devonian to Cretaceous Periods, having a straight or coiled chambered shell characterized by more or less intricate suture patterns where the septa between individual chambers join the outer shell wall.
from The Century Dictionary.
- noun One of the Ammonoidea.
- Pertaining to or having the characteristics of the Ammonoidea.
from the GNU version of the Collaborative International Dictionary of English.
- noun one of the coiled chambered fossil shells of extinct mollusks; same as
ammonite .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun
ammonite - adjective Characteristic of an
ammonite
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun one of the coiled chambered fossil shells of extinct mollusks
Etymologies
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Examples
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- Models of the ammonoid from Mysterious Island and the Hydra from Jason and the Argonauts
Waste-o-time-Meme No. 839: The Objects Around Us frankwu 2007
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House was right, but the ammonoid pearls were not fit to be strung along a necklace.
Wired Top Stories Brian Switek 2011
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Reached by e-mail, Klug noted that "The ammonoids' reactions to the parasites changed through ammonoid evolution," but cautions that "we cannot study the detailed reactions" of these interactions since both the hosts and parasites are long gone.
Wired Top Stories Brian Switek 2011
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Devonian-age ammonoid shells, and this indicated that the inside of the shell - which had since dissolved away - was pockmarked with bumps.
Wired Top Stories Brian Switek 2011
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After sampling a variety of ammonoid specimens spanning a range of time between 405 and 385 million years ago, Klug and his co-authors found that many of these fossils had Housian pits.
Wired Top Stories Brian Switek 2011
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More than that, the changes in pit type in different ammonoid species over a 20 million year swath suggests a co-evolution between parasite and host.
Wired Top Stories Brian Switek 2011
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They show, in a large vertical / layered series of formations, how an ammonoid (a shelled creature similar to our chambered Nautilus of today) evolved over millions of years in the same region.
Latest Articles 2008
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Given that the current estimate of the total number of species on the planet is about 2 million, this rate, by the end of the next century, will be equivalent in biological effect to the catastrophic event (s) of 65 million years ago that eliminated not only the dinosaurs but also the ammonoid cephalopods, many echinoids, and many genera of foraminifera and of calcareous phytoplankton, the kind of mass extinction that previously in the earth's history has required 5 million years for recovery, such recovery resulting in
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The magazine said the Chanel couture dress "makes her look like she's encrusted with ammonoid fossils.
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