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hot air (informal) empty or exaggerated speech or writing.
hot-air balloon a bag made of thin material that is inflated with hot air, causing it to rise and float in the atmosphere. Large hot-air balloons can be attached to a basket or gondola, and used to transport people or equipment.
hotbed a bed of soil, usu. heated by fermenting manure and covered by glass, used to protect sensitive plants or to grow plants out of season. [2 definitions]
hot-blooded easily aroused or angered; excitable. [2 definitions]
hotbox a metal bearing and its housing, as on a railroad car, that have been overheated by excessive friction of an axle.
hot-button producing strong feelings; emotionally charged.
hot cake a pancake.
hot cell an enclosure designed to house radioactive materials in a safe manner so they can be worked on or tested by remote control.
hot chocolate a beverage made of hot milk, sugar, and cocoa powder; cocoa.
hot cross bun a bunlike pastry marked with a cross of frosting, often associated with Lent.
hot dog a hot, cooked frankfurter or wiener usu. eaten in a soft bun. [3 definitions]
hotel a commercial establishment that provides overnight lodging, meals, and other services.
hotelier one who owns or manages a hotel.
hot flash a feeling of heat flooding over the body, esp. experienced by women during menopause.
hotfoot a practical joke in which a match is secretly placed between the upper and sole of someone's shoe and is lit. [3 definitions]
hothead a person who angers or loses his or her temper easily. [2 definitions]
hotheaded easily angered; quick-tempered. [2 definitions]
hothouse a heated glass building used to grow plants that require a constant warm temperature. [2 definitions]
hot line a direct communication system set up for use in times of emergency or crisis, esp. between heads of government. [2 definitions]
hot pepper any of numerous peppers having sharp, pungent flesh ranging from mild to very hot. [2 definitions]
hot plate a small, usu. electric, portable appliance for cooking or heating food.