n.
Pronunciation: ' b ō -l ə s
Function: noun
Inflected Form: plural bo · lus · es
Etymology: Late Latin, from Greek b ō los lump
Date: 1562
1 : a rounded mass: as a : a large pill b : a soft mass of chewed food
2 : a dose of a substance (as a drug) given intravenously specifically : a large dose given for the purpose of rapidly achieving the needed therapeutic concentration in the bloodstream