Definition of "bolus" [bo•lus]

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

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "In reading messages I see the word bolus or something like that."
• "In gray matter, the labelled bolus is dispersed within three main compartments during image acquisition: the intravascular compartment; intracellular tissue space; and the extracellular tissue space."
• "The weapon is called the bolus, and flying through the air it encircles the legs of the guana, bringing it to the earth."