exterminator
- n someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects)
extern
- n a nonresident doctor or medical student; connected with a hospital but not living there
external-combustion engine
- n a heat engine in which ignition occurs outside the chamber (cylinder or turbine) in which heat is converted to mechanical energy
external auditory canal
- n either of the passages in the outer ear from the auricle to the tympanic membrane
external carotid
- n the branch of the carotid artery that supplies blood to the face and tongue and external parts of the head