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high-pressure of, concerning, or characterized by a pressure much higher than normal atmospheric pressure. [4 definitions]
high priest a priestly leader, esp. of ancient Judaism. [2 definitions]
high priestess a woman who functions as a high priest.
high-proof of an alcoholic liquor, containing a relatively high percentage of alcohol.
high-protein of a diet or food substance, rich in protein.
high-quality of a quality higher than average.
high relief in friezes and the like, the projection of sculptured figures by about one half of their natural depth.
high-resolution pertaining to an image that has fine detail and a large number of pixels per unit area, or to a device that produces such an image.
high-rise of, concerning, typical of, or being a building that has many stories and elevators. [2 definitions]
highroad a course or direction that is easy or sure.
high school a school consisting of grades nine or ten through twelve or, formerly, grades seven through twelve.
high seas the area of a sea or ocean outside the territorial limit of any country.
high-sounding imposing or impressive-sounding but pretentious.
high-speed designed to travel or operate at higher-than-standard speeds.
high-spirited enthusiastic, fiery, or courageous in temperament or behavior.
high street (chiefly British) the main commercial street of a town where many shops and other businesses are located.
high-strung exceptionally nervous; easily upset; usually tense.
hightail (informal) to flee; run away; leave hurriedly.
hightail it (informal) to move or leave hurriedly.
high-tech see high technology. [2 definitions]
high technology any technology that requires or involves sophisticated techniques or equipment, such as genetic engineering or microelectronics; high-tech.