The term "bolus" can refer to different things depending on the context:
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Medical Context: In medicine, a bolus refers to a specific dose of a medication or a substance administered all at once. For example, a bolus injection is a single, concentrated dose of medication delivered via injection, often used for fast-acting effects.
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Digestive Context: In relation to digestion, a bolus is a small rounded mass of food that has been chewed and mixed with saliva, making it ready to be swallowed.
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Veterinary Medicine: In veterinary practice, a bolus can also refer to a large pill intended for animals, often used to deliver medications.
In all cases, the term implies a single, significant amount of something that is meant to be administered or consumed at one time.