Any of various squidlike cephalopod marine mollusks of the genus Sepia that have ten arms and a calcareous internal shell and eject a dark,inky fluid when in danger.

• 乌贼，任一种乌贼属的乌贼状的海洋软体头足动物，生有十个腕以及一个钙质内壳，并且在危险时能排出黑色墨水状液体。