Carina

Definition 1

A ridge or ridge-like structure. In humans it usually refers to the trachea. The carina of trachea is part of the lowest tracheal cartilage which is placed between the orifices of the two bronchi. (NCI Thesaurus)

Definition 2

A ridge at the base of the trachea (windpipe) that separates the openings of the right and left main bronchi (the large air passages that lead from the trachea to the lungs) (NCI Dictionary)

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Tooth decay that extends through the enamel into the dentin layer.

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