<unk>  is the consumption of a substance by an organism. In animals, it normally is accomplished by taking in a substance through the mouth into the gastrointestinal tract, such as through eating or drinking. In single-celled organisms<unk>  takes place by absorbing a substance through the cell membrane. Besides nutritional items, substances that may be ingested include medication (where<unk>  is termed oral administration), recreational drugs, and substances considered inedible, such as foreign bodies or excrement.<unk>  is a common route taken by pathogenic organisms and poisons entering the body.<unk>  can also refer to a mechanism picking up something and making it enter an internal hollow of that mechanism, e.g. "a grille was fitted to prevent the pump from<unk> g driftwood".
Ingestion
Inhalation
Injection 
Inoculation
Airborne 
Bolus 
Dental aerosol
Heat