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in·ter·nal in-'tərn-əl adj
1) existing or situated within the limits or surface of something: as
a) situated near the inside of the body <an \internal layer of abdominal muscle>
b) situated on the side toward the midsagittal plane of the body <the \internal surface of the lung>
2) present or arising within an organism or one of its parts <an \internal stimulus>
3) applied or intended for application through the stomach by being swallowed <an \internal remedy>
in·ter·nal·ly in-'tərn-əl-ē adv
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in·ter·nal (in-turґnəl) [L. internus] situated or occurring within or on the inside; many anatomical structures formerly called internal are now correctly termed medial.Medical dictionary. 2011.