(medicine) An instrument that monitors the peak expiratory flow rate of air from a person's bronchi; used to manage asthma.

(public transport) The number of vehicles required to operate the highest-frequency service on a route.

plural of peak vehicle requirement

plural of peak flow meter

A peak in Mount Lawrence Grassi, Ehagay Nakoda, Canmore, Kananaskis, Alberta, Canada

(space science) A mountain peak, on a solid, non-luminous celestial body, which experiences continuous or near-continuous illumination due to a combination of high altitude, very high latitude, and being on a celestial body with very low axial tilt.

(informal) Resembling or characteristic of the supernatural drama television series Twin Peaks.

comparative form of Twin Peaksy: more Twin Peaksy

superlative form of Twin Peaksy: most Twin Peaksy

A set of peaks (on a graph etc.)