A round mass of something, especially of chewed food in the mouth or alimentary canal.
A single, large dose of a drug, especially one in that form.
To take a bolus (dose) of insulin at a mealtime in order to control one's blood glucose level in diabetes.
To administer (a drug) in bolus dosing, that is, dosing in (one or more) boluses.
The portion of food which is brought back into the mouth by ruminating animals from their first stomach, to be chewed a second time.
To bring back into the mouth and chew a second time.