- a small, round lump or mass, as of chewed food
- Med. a mass injected into a blood vessel, as an opaque contrast medium or a radioactive tracer
- Vet.Med. a large pill
Origin of bolusML: see bole
- A round mass: “A dense bolus of trapped dolphins fills the frame” (Kenneth Browser).
- a. A single, relatively large quantity of a substance, such as a dose of a drug, intended for therapeutic use and taken orally.b. A concentrated mass of a substance administered intravenously for diagnostic or therapeutic purposes.
- A soft mass of chewed food within the mouth or digestive tract.
Origin of bolusMedieval Latin bōlus, from Greek bōlos, lump of earth.
(plural boli or boluses)
- Boli is the somewhat more common plural form of bolus in scholarly use.
From Late Latin bōlus (“clod of earth, lump”), from Ancient Greek βωλος (bōlos, “clod, lump”).