High'-prĕss'ŭre, a.

(hĭ'prĕsh'ər), a. (Steam-eng.) Having or involving a pressure exceeding that of the atmosphere; or, in a more restricted sense, exceeding about fifty pounds on the square inch;—said of steam and steam-engines.

High-pressure steam-engine, an engine in which high steam is used; it may be either condensing or non-condensing; by some the term is used only of the latter. See STEAM-ENGINE.