| 释义 |
〔belemnite〕A cone-shaped, fossilized internal shell of any of an extinct genus of cephalopods related to the cuttlefish.箭石：由灭绝的与乌贼有血亲关系的头足纲动物的内壳形成的尖锥状化石〔thunderstone〕Any of various mineral concretions, such as a belemnite, formerly supposed to be thunderbolts.箭石，雷石，陨石：如过去被认为是雷电的箭石等各种矿物混合 |