bo·lus
noun/ˈbəʊləs/
/ˈbəʊləs/
- (medical) a single amount of a drug that is given at one time
（单次给药的）剂量 - (specialist) a small round mass of a substance, especially food that has been chewed to make it soft before it is swallowed
小团；小丸；（尤指咀嚼后吞咽的）食团
Word Originmid 16th cent. (denoting a large pill): via late Latin from Greek bōlos ‘clod’.