Adjective internal (comparative more internal, superlative most internal) Of or situated on the inside. We saw the internal compartments of the machine. (medicine) Within the body.

Understanding the Context

In anatomy and zoology, in general, inner or interior; not superficial; deep-set; away from the surface or next to the axis of the body or of a part: as, the internal carotid or iliac artery; the internal head of the gastrocnemius.