PS (horsepower) - definition of PS (horsepower) by The Free Dictionary
horse·pow·er (hôrs′pou′ər) n. pl. horse·power 1. Abbr. hp A unit of power in the US Customary System, equal to 745.7 watts or 33,000 foot-pounds per minute. 2. The power exerted by a horse in pulling. 3. Informal Effective strength: political horsepower; ...