Medical Definition of neck
1a: the usually narrowed part of an animal that connects the head with the body; specifically : the cervical region of a vertebrateb: the part of a tapeworm immediately behind the scolex from which new proglottids are produced
2: a relatively narrow part suggestive of a neck: asa: a narrow part of a bone <the neck of the femur>b: cervix 2c: the part of a tooth between the crown and the root
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