Definition of cuttlefish noun from the Oxford Advanced Learner's Dictionary

 

cuttlefish

 noun
noun
BrE BrE//ˈkʌtlfɪʃ//
 
; NAmE NAmE//ˈkʌtlfɪʃ//
 
(pl. cuttlefish) Invertebrates
 
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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 related entries: Invertebrates Word Origin late 16th cent.: from cuttle + fish.
See the Oxford Advanced American Dictionary entry: cuttlefish