Definition of niggling for English Language Learners. : causing you to feel a slight pain or to be worried or annoyed for a long time.
What is PPAP? The Production Part Approval Process (PPAP) is a standardized process in the automotive and aerospace industries that helps manufacturers and suppliers communicate and approve production designs and processes before, during, and after manufacture.
BiPAP is a term that is sometimes used colloquially to refer to bilevel positive airway pressure (BPAP). A BiPAP machine, which is more accurately called a BPAP machine, is a breathing apparatus that helps its user get more air into his or her lungs. Created in the 1990s, the BPAP machine is derived from the continuous positive airway pressure (CPAP) machine. Unlike a CPAP machine, however, a BPAP machine uses variable levels of air pressure instead of continuous pressure.