Dictionary:

bolus

  (bō'ləs)

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

[Medieval Latin bōlus, from Greek bōlos, lump of earth.]

A mass of food ready to be swallowed or a mass passing through the intestines.

1. a rounded mass of food or pharmaceutical preparation ready to be swallowed, or such a mass passing through the gastrointestinal tract. In previous times most medication for horses was given by bolus. Called also ball.
2. a concentrated mass of pharmaceutical preparation, e.g. an opaque contrast medium, given intravenously.
3. a mass of scattering material, such as wax or paraffin, placed between the radiation source and the skin to achieve a precalculated isodose pattern in the tissue irradiated.

• alimentary b. — the mass of food, made ready by mastication, that enters the esophagus at one swallow.
• intraruminal identification b. — contain passive radiofrequency responders for individual animal identification. Used in sheep and cattle.
• physic b. — see physic (2).
• purging b. — an oldtime treatment for equine colic. Usually contained aloes or istin.

Bolus can refer to:

• Bolus (medicine) - the administration of a drug, medication or other substance in the form of a single, large dose
• Bolus (digestion) - a ball-shaped mass moving through the digestive tract
• Bolus hook - an instrument in a Jacquard loom
• Bolus can also refer to a pastry from the Netherlands.
• Bolus (also Baulus) is an Anatolian village on the site of ancient Berissa

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