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lengthwise; in official anatomic nomenclature it designates a structure that is parallel to the long axis of the body or an organ.
1. Running lengthwise; in the direction of the long axis of the body or any of its parts. Synonym(s): longitudinalis [TA]
2. Studied over a period of time, diachronic; contrast with cross-sectional or synchronic, which give equivalent results only under certain strict conditions of stability and equilibrium. Such strict attention to these conditions is of the greatest importance in the study of survivorship either in demographics or in cell economy (for example, survival pattern of erythrocytes and platelets).
[L. longitudo, length]