pah

Initialism of phenylalanine hydroxylase.

Initialism of polycyclic aromatic hydrocarbon.

Researchers analysed samples of nurdles and burnt lumps of plastic from four Sri Lankan beaches for heavy metals and various chemicals, including benzotriazole UV-stabilisers, which are used to prevent discoloration in plastics, bisphenols and polyaromatic hydrocarbons (PAHs). […] Of particular concern, they said, were levels of PAHs found on the burnt lumps, which far exceeded safe limits for consumer products set by the EU.

Initialism of pulmonary arterial hypertension.

Initialism of paradoxical adipose hyperplasia.

Used to express distaste, disgust or outrage.

Fie! fie! fie! pah! pah! Give me an ounce of civet, good apothecary, to sweeten my imagination.

She was rarely suffered out of their sight; never went beyond the domains of the castle, unless well attended, or, rather, well watched; had continual lectures read to her about strict decorum and implicit obedience; and, as to the men—pah! she was taught to hold them at such distance and distrust that, unless properly authorized, she would not have cast a glance upon the handsomest cavalier in the world—no, not if he were even dying at her feet.

Dated form of pa (“Maori fort”).