A rounded mass of anything, esp. a large pill.
- A round mass: "A dense bolus of trapped dolphins fills the frame” ( Kenneth Browser).
- A single, relatively large quantity of a substance, such as a dose of a drug, intended for therapeutic use and taken orally.
- A concentrated mass of a substance administered intravenously for diagnostic or therapeutic purposes.
- A soft mass of chewed food within the mouth or alimentary canal.