1. Anything, especially in a histologic specimen or a graphic record, which is caused by the technique used and does not reflect the original specimen or experiment.
2. A skin lesion produced or perpetuated by self-inflicted action, as in dermatitis artefacta.
The information shown above for artifact is provided by Stedman's.
* Stedman's, part of Lippincott Williams & Wilkins, provide a comprehensive line of health-science publications for healthcare professionals and medical students.