(organic chemistry) The ester of amyl alcohol (pentanol) and nitric acid, C₅H₁₁NO₃, used to control angina and as an antidote to cyanide poisoning.

The high-pitched sound of a small object moving rapidly through air. / (informal) Energy; vigor; vim. / (Britain, New Zealand) A zip fastener. / (slang) Zero; nothing. / A trip on a zipline.

To perform thymectomy upon.

(quantum mechanics) Of, pertaining to, or resembling a boson.