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English definition of “arch”

arch

noun [C] (BODY)    /ɑːtʃ/ US  /ɑːrtʃ/ specialized
any organ or part of the body that is curved in shape: The premature loss of primary teeth causes shrinking of the dental arch.Substances and structures in the body
(Definition of arch noun (BODY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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