Thesaurus: ammonite

Related headwords

Definitions

1. n. A fossil cephalopod shell related to the nautilus. There are many genera and species, and all are extinct, the typical forms having existed only in the Mesozoic age, when they were exceedingly numerous. They differ from the nautili in having the margins of the septa very much lobed or plaited, and the siphuncle dorsal. Also called serpent stone, snake stone, and cornu Ammonis.
2. n. one of the coiled chambered fossil shells of extinct mollusks
3. A fossil cephalopod shell related to the nautilus. There are many genera and species, and all are extinct, the typical forms having existed only in the Mesozoic age, when they were exceedingly numerous. They differ from the nautili in having the margins of the septa very much lobed or plaited, and the siphuncle dorsal. Also called serpent stone, snake stone, and cornu Ammonis.
4. A fossil cephalopod shell related to the nautilus. There aremany genera and species, and all are extinct, the typical formshaving existed only in the Mesozoic age, when they were exceedinglynumerous. They differ from the nautili in having the margins of thesepta very much lobed or plaited, and the siphuncle dorsal. Alsocalled serpent stone, snake stone, and cornu Ammonis.
5. n:100 n. one of the coiled chambered fossil shells of extinct mollusks