Main Entry: in·ter·nal

Pronunciation: \in-ˈtərn-^əl\

Function: adjective

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-ˈtərn-^əl-ē\ adverb