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

 

seashell

 noun
noun
BrE BrE//ˈsiːʃel//
 
; NAmE NAmE//ˈsiːʃel//
 
 
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the shell of a small creature that lives in the sea, often found empty when the creature has died
See the Oxford Advanced American Dictionary entry: seashell