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Definition of bolus noun from the Oxford Advanced Learner's Dictionary

bolus

noun
 
/ˈbəʊləs/
 
/ˈbəʊləs/
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  1. (medical) a single amount of a drug that is given at one time synonym dose
  2. (specialist) a small round mass of a substance, especially food that has been chewed to make it soft before it is swallowed
  3. Word Originmid 16th cent. (denoting a large pill): via late Latin from Greek bōlos ‘clod’.
See bolus in the Oxford Advanced American Dictionary
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