bolus

bolus
[ˈbəʊləs]
(pl. boluses)
  1. a small rounded mass of a substance, especially of chewed food at the moment of swallowing
    块,团(尤指咀嚼后准备下咽的食物)
    ■a type of large pill used in veterinary medicine
    (兽医用的)大丸药
    ■(Medicine)a single dose of drug or other medicinal preparation given all at once
    (医)一剂药
语源
  1. mid 16th cent. (denoting a large pill of medicine): via late Latin from Greek bōlos 'clod'
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