any of various marine mollusks of the class Cephalopoda,such as the octopus,squid,cuttlefish,or nautilus,having a large head,large eyes,prehensile tentacles,and,in most species,an ink sac containing a dark fluid used for protection or defense是什么意思_any of various marine mollusks of the class Cephalopoda,such as the octopus,squid,cuttlefish,or nautilus,having a large head,large eyes,prehensile tentacles,and,in most species,an ink sac containing a dark fluid used for protection or defense在线翻译_英语_读音_用法_例句