Bolus (noun)

1. A rounded mass of a substance, especially of chewed food, ready to be swallowed.
2. A single large dose of a medication or other substance.

Origin:

From latin bolus ("lump, ball"), from ancient greek βόλος (bólos, "lump, clod").

Examples:

1. She took a bolus of food before swallowing.
2. The patient was given a bolus of the antibiotic to treat the infection.
3. The bolus of food was too big to swallow comfortably.
4. The bolus of medication was administered through an IV.
5. The bolus of food was stuck in the patient's throat.