bolus /ˈbəʊləs/noun 2verb 2forms 4 noun2 •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.I gave him a bolus, twice the size of a gooseberry. — 1863 verb2 •To administer (a drug) in bolus dosing, that is, dosing in (one or more) boluses. •To take a bolus (dose) of insulin at a mealtime in order to control one's blood glucose level in diabetes. formsbolused · bolusing · boluses · boli