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nearest to a point of reference, as to a center or median line or to the point of attachment or origin.
1. Nearest the trunk or the point of origin, said of part of a limb, of an artery or a nerve, so situated. Toward the median plane following the curvature of the dental arch, in contrast to distal2. Synonym(s): proximalis [TA]
2. dental anatomy denoting the surface of a tooth in relation with its neighbor, whether mesial or distal, that is, nearer to or farther from the anteroposterior median plane.
[Mod. L. proximalis, fr. L. proximus, nearest, next]