Origin of belemnitefrom Classical Greek belemnon, a dart, arrow, probably akin to ballein, to throw (see ball) + -ite
the cigar-shaped fossilized internal shell of extinct cephalopods (order Belemnoidea) of the Mesozoic Era
Any of a group of extinct squidlike cephalopod mollusks of the Jurassic and Cretaceous Periods, having a cone-shaped internal shell.
Origin of belemniteNew Latin belemnītēs from Greek belemnon dart ; see gwelə- in Indo-European roots.
- Any of various extinct cephalopod mollusks of the order Belemnoidea that lived from the Triassic into the Tertiary Period. Belemnites had a large, cone-shaped internal shell with a complex structure that served as a support for muscles and as a hydrostatic device. Belemnites were closely related to the present-day squids and cuttlefishes.
- The fossilized internal shell of one of these cephalopods. Belemnites are used as index fossils.