noun: (astronomy, ecology, geology) Initialism of potentially hazardous asteroid.
noun: (biochemistry) Initialism of phytohemagglutinin. [(biochemistry) Any hemagglutinin (lectin) of plant origin, but especially that found in many beans that has a physiological action]
noun: Abbreviation of public health agency.
noun: Initialism of polyhydroxyalkanoate. [(organic chemistry) Any of a group of linear polyesters produced in nature by bacterial fermentation]
