noun

• (US, biology) Initialism of phosphate-buffered saline: a buffer solution commonly used in biological research.
• (management) Initialism of product breakdown structure.
• (psychology) Initialism of positive behavior support.
• (linguistics) Initialism of Proto-Balto-Slavic. [(linguistics) The hypothetical ancestor language or protolanguage of Baltic and Slavic languages, descending from Proto-Indo-European.]
• (US, television) Initialism of Public Broadcasting Service.
• (Australia) Initialism of Pharmaceutical Benefits Scheme.
• (Malta) Initialism of Public Broadcasting Services.