adj 1  :  existing or situated within the limits or surface of something: as  a  :  situated near the inside of the body <an layer of abdominal muscle>   b  :  situated on the side toward the midsagittal plane of the body <the surface of the lung>   2  :  present or arising within an organism or one of its parts <an stimulus>   3  :  applied or intended for application through the stomach by being swallowed <an remedy>  in*ter*nal*ly adv 
 
 
 
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