from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Variant of ammonite.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. ammonite
  • adj. Characteristic of an ammonite

from the GNU version of the Collaborative International Dictionary of English

  • n. one of the coiled chambered fossil shells of extinct mollusks; same as ammonite.

from The Century Dictionary and Cyclopedia

  • Pertaining to or having the characteristics of the Ammonoidea.
  • n. One of the Ammonoidea.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. one of the coiled chambered fossil shells of extinct mollusks


Sorry, no etymologies found.


  • - Models of the ammonoid from Mysterious Island and the Hydra from Jason and the Argonauts

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  • House was right, but the ammonoid pearls were not fit to be strung along a necklace.

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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.

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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.

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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.

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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.

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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.

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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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