lon·gi·tu·di·nal (l n j -t d n- l)adj. Running in the direction of the long axis of the body or any of its parts. |
longitudinal
[lon′jəto̅o̅′dənəl]
Etymology: L, longitudo, length
1 pertaining to a measurement in the direction of the long axis of an object, body, or organ, such as the longitudinal arch of the foot.
2 pertaining to a scientific study (nonexperimental research design) that is conducted over a long period of time, such as the Framingham (Massachusetts) Study of heart disease, with data collected from study participants at more than one point in time. Compare cross-sectional.
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