a batch of mail from a single delivery.
[pohst-bel-uh m] /poʊstˈbɛl əm/ adjective 1. occurring after a war, especially after the American Civil War: postbellum reforms.
/ˈpəʊstˈbɛləm/ adjective 1. (prenominal) of or during the period after a war, esp the American Civil War adj. also postbellum, used in U.S. South from 1874 in reference to American Civil War; see post- + bellicose.
[pohst-boht] /ˈpoʊstˌboʊt/ noun, British. 1. .
- Positive-negative pressure breathing
positive-negative pressure breathing n. Abbr. PNPB Inflation of the lungs with positive pressure and deflation with negative pressure as through the action of an automatic ventilator.