Definition of cuttlefish noun from the Oxford Advanced American Dictionary

 

cuttlefish

 noun
noun
NAmE//ˈkʌt̮lˌfɪʃ//
 
(pl. cuttlefish)
 
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a sea creature with eight arms, two tentacles (= long thin parts like arms), and a wide flat shell inside its body, that produces a black substance like ink when it is attacked
See the Oxford Advanced Learner's Dictionary entry: cuttlefish