Definitions from Wiktionary (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.


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