Medical Definition of external
1: capable of being perceived outwardly : bodily <external signs of a disease>
2a: situated at, on, or near the outside <an external protective covering> <an external muscle>b: directed toward the outside : having an outside object <external perception> <eyesight and the other external senses>c: used by applying to the outside <an external lotion>
3a: situated near or toward the surface of the body; also : situated away from the mesial plane <the external condyle of the humerus>: arising or acting from outside : having an outside origin <external causes> <external stimuli>b: of, relating to, or consisting of something outside the mind : having existence independent of the mind <sensations aroused by external phenomena> <external reality>
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