Definitions of PBO:
- noun: (organic chemistry) Initialism of piperonylbutoxide.
- noun: Initialism of polybenzobisoxazole. [A thermoset liquid crystalline polyoxazole with high tensile strength.]
- noun: (Canada) Initialism of Parliamentary Budget Officer.
- noun: Initialism of public benefit organization.
- noun: Initialism of paperback original.
- noun: Initialism of pension benefit obligation.
(Definitions from Wiktionary)
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