belemnite

belemnite
[ˈbɛləmnʌɪt]
noun
  1. an extinct cephalopod mollusc with a bullet-shaped internal shell that is typically found as a fossil in marine deposits of the Jurassic and Cretaceous periods
    箭石(有子弹内壳的头足类软体动物,已绝种,其化石多见于侏罗纪和白垩纪时期的海洋沉积中)
  2. Order Belemnoidea, class Cephalopoda: many genera
    箭石目,头足纲: 多属
语源
  1. early 17th cent.: from modern Latin belemnites, based on Greek belemnon 'dart'
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