| Dictionary, Encyclopedia and Thesaurus - The Free Dictionary 3,591,746,099 visitors served. |
Dictionary/ thesaurus | Medical dictionary | Legal dictionary | Financial dictionary | Acronyms | Idioms | Encyclopedia | Wikipedia encyclopedia | ? |
ammonite |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.02 sec. |
|
|
ammonite (ăm`ənīt), one of a type of extinct marine cephalopod cephalopod , member of the class Cephalopoda, the most highly organized group of mollusks (phylum Mollusca), and including the squids, octopuses, cuttlefish, and nautiluses. The class as a whole has become adapted for a free-swimming existence.
..... Click the link for more information. mollusk, related to the nautilus nautilus, cephalopod mollusk belonging to the sole surviving genus (Nautilus) of a subclass that flourished 200 million years ago, known as the nautiloids. ..... Click the link for more information. and resembling it in having an elaborately coiled and chambered shell. Unlike the interiors of nautilus shells, the chambers of ammonite shells display intricately shaped septa and sutures. The type included numerous species, which were widely distributed during the Mesozoic era, about 200 million years ago. Ammonites are classified in the phylum Mollusca Mollusca , taxonomic name for the one of the largest phyla of invertebrate animals (Arthropoda is the largest) comprising more than 50,000 living mollusk species and about 35,000 fossil species dating back to the Cambrian period. ..... Click the link for more information. , class Cephalopoda, subclass Ammonoidea. ammonite1 1. any extinct marine cephalopod mollusc of the order Ammonoidea, which were common in Mesozoic times and generally had a coiled partitioned shell. Their closest modern relative is the pearly nautilus 2. the shell of any of these animals, commonly occurring as a fossil ammonite2 1. an explosive consisting mainly of ammonium nitrate with smaller amounts of other substances, such as TNT 2. a nitrogenous fertilizer made from animal wastes ammonite [′a·mə‚nīt] (materials) An explosive containing 70-95% ammonium nitrate. (paleontology) A fossil shell of the cephalopod order Ammonoidea. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
|
| Encyclopedia |
| Free Tools: |
For surfers:
Free toolbar & extensions |
Word of the Day |
Help
For webmasters: Free content | Linking | Lookup box | Double-click lookup | Partner with us |
|---|