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cavity

noun [C]
 
 
/ˈkæv.ɪ.ti/ US  /-ə.t̬i/

Definition

a hole, or an empty space between two surfaces: The gold was hidden in a secret cavity.Holes, hollows and dips a hole in a toothDentistryThe teethProblems with bones, joints and teeth
(Definition of cavity noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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