bolus

https://doi.org/10.1351/goldbook.15519
  1. Single dose of a substance, originally a large pill.
  2. Dose of a substance administered by a single rapid intravenous injection.
  3. Concentrated mass of food ready to be swallowed.
Source:
PAC, 2007, 79, 1153. (Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)) on page 1182 [Terms] [Paper]