internal angle; internal auditor; internal auditory artery; internal auditory vein; internal carotid artery; internal cerebral vein; internal combustion; internal control; internal drive; internal ear; internal iliac artery; internal iliac vein; internal jugular vein; internal maxillary artery; internal medicine; internal organ; internal representation; internal respiration; internal revenue; internal revenue agent; internal revenue service; internal rhyme; internal secretion; internal spermatic artery; internal-combustion engine;