hermit crab

noun
🔊/ˈhɜːmɪt kræb/
🔊/ˈhɜːrmɪt kræb/
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  1. a crab (= a sea creature with eight legs and, usually, a hard shell) that has no shell of its own and has to use the empty shells of other sea creatures寄居蟹Topics Fish and shellfishc2