The compound noun "trailer-park" is a distinctly American 20th-century formation, built from two older English words. "Trailer" evolved from the verb "to trail," originally meaning something that is pulled behind, and by the 1930s specifically denoted a mobile home designed to be towed by a vehicle. "Park" derives from the Medieval Latin 'parricus', meaning an enclosed space, which evolved to mean a large public garden and later any designated area for a specific purpose. The compound logically fuses these elements: a "park" or designated area where "trailers" or mobile homes are situated. Its modern connotation, often implying a low-income residential area, developed through socio-economic association rather than the original, neutral descriptive meaning of the morphemes.

Structure: trailer (a mobile home) + park (a designated area) - trailer: Origin: English (from 'trail' + '-er'). Functional role: The core noun, referring to the type of dwelling. - park: Origin: Old French 'parc', from Medieval Latin 'parricus'. Functional role: A noun indicating the designated land or area.