bolus ns meaning
bolus [bÅâ²lÅ­s] Type:Term. Definitions 1. A single, relatively large quantity of a substance, usually one intended for therapeutic use, such as a bolus dose of a drug injected intravenously. 2. A masticated morsel of food or another substance ready to be swallowed, such as a bolus of barium for radiographic studies. 3.