Definitions from Wiktionary ( )

▸ noun:  (biochemistry) Initialism of phenylalanine hydroxylase.
▸ noun:  (organic chemistry) Initialism of polycyclic aromatic hydrocarbon. [(organic chemistry) Any of a class of organic compounds composed of multiple aromatic rings, many of which are found in coal and in oil deposits, and are produced by the combustion of organic matter.]
▸ noun:  (pathology) Initialism of pulmonary arterial hypertension.
▸ noun:  (medicine) Initialism of paradoxical adipose hyperplasia.
▸ noun:  Dated form of pa (“Maori fort”). [(colloquial) Father, papa.]

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